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Surface formed by rotating an ellipse
A spheroid, also known as an ellipsoid of revolution or rotational ellipsoid, is a quadric surface obtained by rotating an ellipse about one of its principal
Spheroid
Shape of a spinning body of self-gravitating fluid
A Maclaurin spheroid is an oblate spheroid which arises when a self-gravitating fluid body of uniform density rotates with a constant angular velocity
Maclaurin_spheroid
Class of galaxy that has spiral structures extending from their cores
Center), or in a spheroidal galactic bulge around the galactic core. However, some stars inhabit a spheroidal halo or galactic spheroid, a type of galactic
Spiral_galaxy
Type of prehistoric stone artifact
In archaeology, a spheroid is a piece of rock that has been shaped into a nearly spherical shape (spheroidal). Spheroids have been found at sites from
Spheroid_(lithic)
Shortest paths on a bounded deformed sphere-like quadric surface
triangulation network on an ellipsoid is therefore a set of exercises in spheroidal trigonometry (Euler 1755). If the Earth is treated as a sphere, the geodesics
Geodesics_on_an_ellipsoid
Solutions of the Helmholtz equation
Spheroidal wave functions are solutions of the Helmholtz equation that are found by writing the equation in spheroidal coordinates and applying the technique
Spheroidal_wave_function
The Airy spheroid or Airy ellipsoid is a mathematical model of the Earth, an Earth ellipsoid, designed to fit the well for the British Isles. It is named
Airy_spheroid
an irregular oblate spheroid because neither the interior nor the surface of the Earth are uniform, so a reference oblate spheroid such as the World Geodetic
Timeline_of_Earth_estimates
Multicellular tumor spheroids (MCTS) are three-dimensional (3D) aggregates of cells that serve as widely used in-vitro models of tumors․ Unlike conventional
Multicellular_tumor_spheroids
Three-dimensional orthogonal coordinate system
Oblate spheroidal coordinates are a three-dimensional orthogonal coordinate system that results from rotating the two-dimensional elliptic coordinate system
Oblate_spheroidal_coordinates
Type of cast iron
iron, also known as ductile cast iron, nodular cast iron, spheroidal graphite iron, spheroidal graphite cast iron and SG iron, is a type of graphite-rich
Ductile_iron
Three-dimensional coordinate system
Prolate spheroidal coordinates are a three-dimensional orthogonal coordinate system that results from rotating the two-dimensional elliptic coordinate
Prolate spheroidal coordinates
Prolate_spheroidal_coordinates
Quadric surface that looks like a deformed sphere
length, then the ellipsoid is an ellipsoid of revolution, also called a spheroid. In this case, the ellipsoid is invariant under a rotation around the third
Ellipsoid
Byproduct of iron forging
Hammerscale, also written hammer scale, is a flaky or spheroidal byproduct of the iron forging process (for modern equivalent, see mill scale). Hammerscale
Hammerscale
Imaginary line halfway between Earth's North and South poles
rotating spheroid (such as a planet) is the parallel (circle of latitude) at which latitude is defined to be 0°. It is an imaginary line on the spheroid, equidistant
Equator
Special type of functions in mathematics
In mathematics, prolate spheroidal wave functions (PSWFs) are eigenfunctions of the Laplacian in prolate spheroidal coordinates, adapted to boundary conditions
Prolate spheroidal wave function
Prolate_spheroidal_wave_function
Medical condition
Hereditary diffuse leukoencephalopathy with spheroids (HDLS) is a rare adult onset autosomal dominant disorder characterized by cerebral white matter
Hereditary diffuse leukoencephalopathy with spheroids
Hereditary_diffuse_leukoencephalopathy_with_spheroids
Outward bulge around a planet's equator due to its rotation
rotation about the body's axis. A rotating body tends to form an oblate spheroid rather than a sphere. The planet Earth has a rather slight equatorial bulge;
Equatorial_bulge
Theorem about gravity
gravity g (including the effect of centrifugal force) on the surface of a spheroid in hydrostatic equilibrium (being a fluid or having been a fluid in the
Clairaut's_theorem_(gravity)
Geometric figure which approximates the Earth's shape
An Earth ellipsoid or Earth spheroid is a mathematical figure approximating the Earth's shape and size, used as part of a reference frame for coordinates
Earth_ellipsoid
Work by Archimedes
On Conoids and Spheroids (Ancient Greek: Περὶ κωνοειδέων καὶ σφαιροειδέων) is a surviving work by the Greek mathematician and engineer Archimedes (c. 287
On_Conoids_and_Spheroids
Distance from the Earth surface to a point near its center
on or near its surface. Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equatorial radius
Earth_radius
Special mathematical functions defined on the surface of a sphere
Wolfram Research. Retrieved 2026-05-02. "DLMF: §14.30 Spherical and Spheroidal Harmonics". NIST Digital Library of Mathematical Functions. National Institute
Spherical_harmonics
Felsic volcanic rock
"blown" spheroids transformed to lithophysae "Blown" spheroid transformed to a lithophysa "Blown" spheroid transformed to a lithophysa "Blown" spheroids transformed
Lithophysa
Team sport played with a bat and ball
protective gear to prevent injury caused by the ball, which is a hard, solid spheroid made of compressed leather with a slightly raised sewn seam enclosing a
Cricket
Size and shape used to model the Earth for geodesy
approximations can be made by modeling the entire surface as an oblate spheroid, using spherical harmonics to approximate the geoid, or modeling a region
Figure_of_the_Earth
Galaxy containing the Solar System
000 light-years radius) is a dense concentration of mostly old stars in a roughly spheroidal shape called the bulge. It has been proposed that the Milky Way lacks
Milky_Way
Ellipse on a spheroid centered on its origin
two points on a spheroid and having the same center as that of the spheroid. Equivalently, it is an ellipse on the surface of a spheroid and centered on
Great_ellipse
Pearl with an irregular shape
Spheroid baroque pearls
Baroque_pearl
Elevated structure supporting a tank
and spheroids found in the United States. The website World's Tallest Water Sphere describes the distinction between a water sphere and water spheroid thus:
Water_tower
Ball-shaped surface of one rounded bone fits into the cup-like depression of another bone
The ball-and-socket joint (or spheroid joint) is a type of synovial joint in which the ball-shaped surface of one rounded bone fits into the cup-like depression
Ball-and-socket_joint
Form of chemical weathering that affects jointed bedrock
Spheroidal weathering is a form of chemical weathering that affects jointed bedrock and results in the formation of concentric or spherical layers of highly
Spheroidal_weathering
Method for specifying point positions
In geometry, a coordinate system is a system that uses one or more numbers, or coordinates, to uniquely determine and standardize the position of the points
Coordinate_system
Type of steel used in Middle Eastern swordmaking
observed are actually stretched rafts or rods formed out of cementite spheroids. Modern attempts to duplicate the metal have not always been entirely
Damascus_steel
Peanut butter candy
peanut butter candy manufactured by The Hershey Company; they are oblate spheroid in shape and covered in candy shells that are colored yellow, orange, or
Reese's_Pieces
Satellite galaxy of the Milky Way
The Sagittarius Dwarf Spheroidal Galaxy (Sgr dSph), also known as the Sagittarius Dwarf Elliptical Galaxy (Sgr dE or Sag DEG), is an elliptical loop-shaped
Sagittarius Dwarf Spheroidal Galaxy
Sagittarius_Dwarf_Spheroidal_Galaxy
Special type of functions in mathematics
In applied mathematics, oblate spheroidal wave functions (like also prolate spheroidal wave functions and other related functions) are involved in the
Oblate spheroidal wave function
Oblate_spheroidal_wave_function
Species of orchid
Catasetum globiflorum, the spheroid-flowered catasetum, is a species of orchid found in Brazil. "Catasetum globiflorum Hook. | Plants of the World Online
Catasetum_globiflorum
Round object
"Ball" is used metaphorically sometimes to denote something spherical or spheroid, e.g., armadillos and human beings curl up into a ball, or making a fist
Ball
Shape taken by a self-gravitating fluid body rotating at constant velocity
German mathematician Carl Gustav Jacob Jacobi. Before Jacobi, the Maclaurin spheroid, which was formulated in 1742, was considered to be the only type of ellipsoid
Jacobi_ellipsoid
Free-floating three-dimensional culture of cells
small capsules in which the cells can grow into spheroids, or 3D cell colonies. Approximately 300 spheroids are usually cultured per bioreactor. 3D cell
3D_cell_culture
Medical condition
Leukoencephalopathy with neuroaxonal spheroids (LENAS), also known as adult-onset leukoencephalopathy with axonal spheroids and pigmented glia (ALSP), hereditary
Leukoencephalopathy with neuroaxonal spheroids
Leukoencephalopathy_with_neuroaxonal_spheroids
Dwarf galaxy escaping the Local Group
XIV) is a small satellite of the Andromeda Galaxy classed as a dwarf spheroidal galaxy. It has an extreme speed of 481 kilometers per second placing this
Andromeda_XIV
Event in track and field athletics
track and field event in which the participant athlete throws an oblate spheroid weight – called a discus – in an attempt to achieve a farther distance
Discus_throw
Scottish mathematician (1698–1746)
Laplace, Legendre, Poisson and Gauss. Maclaurin showed that an oblate spheroid was a possible equilibrium in Newton's theory of gravity. The subject continues
Colin_Maclaurin
Largest type of black hole
astronomical objects that have undergone gravitational collapse, leaving behind spheroidal regions of space that nothing, not even light, can escape. Observational
Supermassive_black_hole
Horizontal angle from north or other reference cardinal direction
approximation assumes the Earth is a slightly squashed sphere (an oblate spheroid); azimuth then has at least two very slightly different meanings. Normal-section
Azimuth
Low-luminosity galaxy of old stars and little dust
A dwarf spheroidal galaxy (dSph) is a term in astronomy applied to small, low-luminosity galaxies with very little dust and an older stellar population
Dwarf_spheroidal_galaxy
Math equation
In mathematics, the spheroidal wave equation is given by ( 1 − t 2 ) d 2 y d t 2 − 2 ( b + 1 ) t d y d t + ( c − 4 q t 2 ) y = 0 {\displaystyle (1-t^{2}){\frac
Spheroidal_wave_equation
Spheroidal carbonaceous particles (SCPs) is a form of black carbon produced from burning fossil fuels in energy production and heavy industry that is thought
Spheroidal carbonaceous particles
Spheroidal_carbonaceous_particles
Spheroidal galaxy in the constellation Draco
The Draco Dwarf is a spheroidal galaxy which was discovered by Albert George Wilson of Lowell Observatory in 1954 on photographic plates of the National
Draco_Dwarf
Property of objects which appear unchanged after a partial rotation
fully rotationally symmetric at any angle are spheres, circles and other spheroids. Formally the rotational symmetry is symmetry with respect to some or
Rotational_symmetry
Coordinate system for planets
equatorial radius is larger than the polar radius, such that they are oblate spheroids. Planetocentric latitude is defined as the angle measured between the
Planetary_coordinate_system
Steel in which the main interstitial alloying constituent is carbon
carbon in the austenite phase; therefore all heat treatments, except spheroidizing and process annealing, start by heating the steel to a temperature at
Carbon_steel
Field of mathematics dealing with three-dimensional Euclidean spaces
dodecahedron, icosahedron cones and cylinders the sphere other quadrics: spheroid, ellipsoid, paraboloid and hyperboloids. Advanced topics include: projective
Solid_geometry
Movement of organelles
axoplasm, called an axonal spheroid, may result. Because axonal transport can be disrupted in a multitude of ways, axonal spheroids can be seen in many different
Axonal_transport
Geographic coordinate specifying north-south position
ellipsoidal body. The above applies to a biaxial ellipsoid (a spheroid, as in oblate spheroidal coordinates); for a generalization, see triaxial ellipsoidal
Latitude
Pathological foci in spleen
Micrograph of the spleen showing darkly stained, spheroid Gamna-Gandy bodies (arrows) outside the vessel wall at the center. Also shown is diffusely scattered
Gandy–Gamna_nodules
Structure containing a single egg cell
An ovarian follicle is a roughly spheroid cellular aggregation set found in the ovaries. It secretes hormones that influence stages of the menstrual cycle
Ovarian_follicle
Ball used in the sport of football
shapes: A sphere, used in association football and Gaelic football A prolate spheroid (elongated sphere), used in the rugby codes and Australian football A lemon
Football_(ball)
Dwarf spheroidal galaxy in the constellation Pegasus
The Pegasus Dwarf Spheroidal (also known as Andromeda VI or Peg dSph for short) is a dwarf spheroidal galaxy about 2.7 million light-years away in the
Pegasus Dwarf Spheroidal Galaxy
Pegasus_Dwarf_Spheroidal_Galaxy
Dwarf spheroidal Galaxy in the constellation Sculptor
Elliptical Galaxy or the Sculptor Dwarf Spheroidal Galaxy, and formerly as the Sculptor System) is a dwarf spheroidal galaxy that is a satellite of the Milky
Sculptor_Dwarf_Galaxy
multiplicative adjustments to the translational and rotational friction of a rigid spheroid, relative to the corresponding frictions in spheres of the same volume
Perrin_friction_factors
Dwarf galaxy in the constellation Fornax
The Fornax Dwarf Spheroidal (formerly known as the Fornax System) is a dwarf elliptical galaxy in the constellation Fornax that was discovered in 1938
Fornax_Dwarf
State of balance between external forces on a fluid and internal pressure gradient
rotating star or planet in hydrostatic equilibrium is usually an oblate spheroid, an ellipsoid in which two of the principal axes are equal and longer than
Hydrostatic_equilibrium
Dwarf Spheroidal galaxy in the constellation Leo
Leo II (or Leo B) is a dwarf spheroidal galaxy about 690,000 light-years away in the constellation Leo. It is one of 24 known satellite galaxies of the
Leo_II_(dwarf_galaxy)
System to specify locations on Earth
statistically significant if a global datum is used. On the GRS 80 or WGS 84 spheroid at sea level at the Equator, one latitudinal second measures 30.715 m,
Geographic_coordinate_system
projective plane Cross-cap Roman surface Boy's surface Sphere Spheroid Oblate spheroid Prolate spheroid Ellipsoid Cone (geometry) Hyperboloid of one sheet Hyperboloid
List_of_surfaces
Team field sport
indicators of wind strength and direction. The football itself is a prolate spheroid leather ball, similar to the balls used in rugby or Australian rules football
American_football
Measure of solute's contribution to viscosity
intrinsic viscosity is very sensitive to the axial ratio of spheroids, especially of prolate spheroids. For example, the intrinsic viscosity can provide rough
Intrinsic_viscosity
Cutaneous receptor in the human eye
mass. End-bulbs are found in the conjunctiva of the eye (where they are spheroidal in shape in humans, but cylindrical in most other animals), in the mucous
Bulboid_corpuscle
Arc crossing all meridians of longitude at the same angle
Möbius transformations. The formulation above can be easily extended to a spheroid. The course of the rhumb line is found merely by using the ellipsoidal
Rhumb_line
Confectionery product made by Mars
manufactured by Mars Inc. first launched in 1937. Maltesers consist of a spheroid malted milk centre surrounded by milk chocolate. The slogan is "The lighter
Maltesers
projective plane Cross-cap Roman surface Boy's surface Sphere Spheroid Oblate spheroid Cone Ellipsoid Hyperboloid of one sheet Hyperboloid of two sheets
List_of_mathematical_shapes
Dwarf spheroidal galaxy
The Ursa Minor Dwarf is a dwarf spheroidal galaxy, discovered by A.G. Wilson of the Lowell Observatory, in the United States, during the Palomar Sky Survey
Ursa_Minor_Dwarf
Fifth planet from the Sun
rotation rate, one turn in ten hours, the shape of the planet is an oblate spheroid; the radius to the equator is about 7% larger than the radius to its poles
Jupiter
Group of related team sports
meters in depth Equipment Football Shape Sphere Lemon Prolate spheroid Prolate spheroid Sphere Circumference 27–28 inches (69–71 cm) 68–70 centimetres
Football
Natural physical entity in space
spherical shape, an achievement known as hydrostatic equilibrium. The same spheroidal shape can be seen on smaller rocky planets like Mars to gas giants like
Astronomical_object
Methods in geodesy
surface of a spheroid, developed by Thaddeus Vincenty (1975a). They are based on the assumption that the figure of the Earth is an oblate spheroid, and hence
Vincenty's_formulae
Variety of diorite with orbicular structure
colors. In these spheroids also a distinct and well-marked radial arrangement of the crystals is apparent. The center of the spheroid is usually white
Napoleonite
American physicist
overlooked. He later recalled that: When I made my proposal for use of a spheroidal nuclear model, it seemed to be an obvious answer which would immediately
James_Rainwater
Map projection system
coordinate system based on the transverse Mercator map projection of the Earth spheroid. As a map projection, it transforms geographic coordinates of locations
Universal Transverse Mercator coordinate system
Universal_Transverse_Mercator_coordinate_system
Empirical relation between galaxy size and surface brightness
brightness. It is mainly observed among elliptical galaxies and other stellar spheroids. The effective radius, written as R e {\displaystyle R_{e}} , contains
Kormendy_relation
Species of fish
Pleudranacanthus sceleratus (Gmelin, 1789) Pleuranacanthus sceleratus (Gmelin, 1789) Spheroides sceleratus (Gmelin, 1789) Sphoeroides sceleratus (Gmelin, 1789) Sphoeroides
Lagocephalus_sceleratus
Large self-illuminated object in space
A star is a luminous spheroid of plasma held together by self-gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked
Star
Relating to the element carbon
chondrite Carbonaceous film Carbonaceous soil C-type (carbonaceous) asteroid Spheroidal carbonaceous particles (SCPs) Merriam Webster definition and date of first
Carbonaceous
Galaxy in the constellation Sextans
The Sextans Dwarf Spheroidal is a dwarf spheroidal galaxy that was discovered in 1990 by Mike Irwin, Peter Bunclark, Mick Bridgeland and Richard McMahon
Sextans_Dwarf_Spheroidal
Tumor originating from a glomus body in the skin
of a glomus tumor from a fingertip. The tumor is the translucent oblate spheroid in the center of the incision, approximate horizontal dimension is 4 millimeters
Glomus_tumor
Type of confection
Flying saucers (Flemish: Zure ouwels) or UFOs are small spheroidal wafer paper capsules filled with sherbet. The first flying saucers were produced in
Flying_saucer_(confectionery)
nuclear force holding them together. The spatial extent of the prolate spheroid nucleon (and larger nuclides) is determined by root mean squared (RMS)
Shape_of_the_atomic_nucleus
Earth's center. Planet Earth is not a perfect sphere, but has an oblate spheroid shape, because the planet's rotation gives the planet an equatorial bulge
Summits farthest from the Earth's center
Summits_farthest_from_the_Earth's_center
Extinct genus of molluscs
Sphaeroceratidae, a family of ammonoid cephalopods characterized by their spheroidal shells with markedly eccentric coiling, fine ribbing, and complex sutures
Megasphaeroceras
Dwarf Spheroidal galaxy
ESO 410-G005 is a dwarf spheroid galaxy. It is a member of the Sculptor galaxy group but is relatively isolated. It has a low surface brightness. The galaxy
ESO_410-G005
Reference frame for geodesy on the continent
and two dimensions that define the spheroid. The North American Datum of 1983 is based on a newer defined spheroid (GRS 80); it is an Earth-centered (or
North_American_Datum
Topics referred to by the same term
Russia USB flash drive, in computing Ultra faint dwarf, a type of dwarf spheroidal galaxy This disambiguation page lists articles associated with the title
UFD
Austrian-American mathematician (1927–2026)
Dolciani Award in 2020. Slepian, D.; Pollak, H. O. (1961). "Prolate spheroidal wave functions, Fourier analysis and uncertainty. I". The Bell System
Henry_O._Pollak
Observatory in London, England
a single oblate spheroid, fixed to the Earth's gravitational centre. The shift from several local spheroids to one worldwide spheroid caused all geographical
Royal_Observatory,_Greenwich
Unit of distance (1,852 m)
nautical mile. Since the Earth is not a perfect sphere but is an oblate spheroid with slightly flattened poles,[citation needed] a minute of latitude is
Nautical_mile
Topics referred to by the same term
Ball lightning, an atmospheric electrical phenomenon Star, a luminous spheroid of plasma held together by self-gravity The projectile of some plasma weapons
Plasma_ball
Dwarf irregular galaxy in the constellation of Pegasus
However, the franchise has not explicitly stated if it is the Irregular, Spheroidal, or an entirely fictional location, but since the series claimed the Pegasus
Pegasus Dwarf Irregular Galaxy
Pegasus_Dwarf_Irregular_Galaxy
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