# spheroid

## Definitions

• WordNet 3.6
• n spheroid a shape that is generated by rotating an ellipse around one of its axes "it looked like a sphere but on closer examination I saw it was really a spheroid"
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Webster's Revised Unabridged Dictionary
• n Spheroid A body or figure approaching to a sphere, but not perfectly spherical; esp., a solid generated by the revolution of an ellipse about one of its axes.
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Century Dictionary and Cyclopedia
• n spheroid A geometrical body approaching to a sphere, but not perfectly spherical.
• n spheroid In geometry, a solid generated by the revolution of an ellipse about one of its axes. When the generating ellipse revolves about its longer or major axis, the spheroid is prolate or oblong; when about its less or minor axis, the spheroid is oblate. The earth is an oblate spheroid—that is, flattened at the poles, so that its polar diameter is shorter than its equatorial diameter. (See earth, 1.) The same figure is assumed by the other planets; hence the properties of the oblate spheroid are of great importance in geodesy and astronomy.
• n spheroid In anthropology, a cranium of nearly spherical form.
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Chambers's Twentieth Century Dictionary
• Spheroid a body or figure nearly spherical, but not quite so—a species of ellipsoid (prolate spheroid, a slightly lengthened sphere; oblate spheroid, a slightly flattened sphere)
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## Etymology

Webster's Revised Unabridged Dictionary
L. spheroides, ball-like, spherical, Gr. ; sphere + e'i^dos form: cf. F. sphéroïde,
Chambers's Twentieth Century Dictionary
Fr.,—L. sphæra—Gr. sphaira.

## Usage

### In literature:

But we do note that he described this object as a "lump," which does not suggest the spheroidal or symmetric.
"The Book of the Damned" by Charles Fort
The earth is a spheroid slightly flattened at the poles.
"Lectures in Navigation" by Ernest Gallaudet Draper
It is a portion of a plain gold spheroid, very thick, with a metal hook at the back to pass through the ear.
"Museum of Antiquity" by L. W. Yaggy
The spores are ellipso-spheroidical or subspheroidical, rough, dusky, 4-6u long, 3-5u broad.
"The Mushroom, Edible and Otherwise" by M. E. Hard
In fact, the earth can be compared to a vast spheroidal boiler.
"The Voyages and Adventures of Captain Hatteras" by Jules Verne
She walked docilely into her spheroid carrier.
"The Game of Rat and Dragon" by Cordwainer Smith
In a much-flattened or lens-shaped spheroid, the form of the ring will vary with its bulk.
"Essays: Scientific, Political, & Speculative, Vol. I" by Herbert Spencer
They knew that the earth was of spheroid form.
"History of Human Society" by Frank W. Blackmar
Goil recognized small spheroids of gold and silver.
"Jack of No Trades" by Charles Cottrell
The spheroids have a radiate structure and often show concentric dark and pale shells.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5" by Various
Strictly speaking, it is a spheroid.
"The Book of Gud" by Dan Spain
The number of these spheroids is increased by the addition of gelatine.
"The Mechanism of Life" by Stéphane Leduc
Thus we obtain that spheroid which best represents the surface covered by the triangulation.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6" by Various
Radiate arrangement is sometimes visible in the crystals of the whole or part of the spheroid.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3" by Various
A sphere cut from a uniaxial crystal at one temperature will be a spheroid at another temperature.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7" by Various
The entire visible universe, then, would be spheroidal in general shape.
"Astronomy" by David Todd
It is made of brass, and is provided with a spheroidal bulb the axis of which is 2 in.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 2" by Various
The spheroid went to the side, sailing low, and out of bounds.
"A Quarter-Back's Pluck" by Lester Chadwick
Flood hit it a mighty "poke" and away the horsehide spheroid sailed, well over the head of Holly Cross in center field.
"Batting to Win" by Lester Chadwick
It nests in deep holes in the stream-banks, and lays six or eight crystal-white spheroidal eggs.
"Elementary Zoology, Second Edition" by Vernon L. Kellogg
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### In poetry:

“I quite realized,” said Columbus
“That the earth was not a rhombus,
But I am a little annoyed
To find it an oblate spheroid.”
"Clerihew – Columbus" by Edmund Clerihew Bentley

### In news:

Southern Pleiades, the Ghost of Jupiter, and dwarf spheroidal galaxy Leo I .
If you were in Charleston, South Carolina, in the last few days and spied a huge spheroid moving through the sky with the word "vodka" emblazoned on its side, don't worry.
Southern Pleiades, the Ghost of Jupiter, and dwarf spheroidal galaxy Leo I.
Southern Pleiades, the Ghost of Jupiter, and dwarf spheroidal galaxy Leo I.
InSphero's GravityPLUS and GravityTRAP kit enables the rapid, easy formation and preparation of 3D microtissue spheroids for generating more physiologically relevant assay data.
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### In science:

In the spheroidal case the average density can be arbitrarily large, while for any given mass the surface area can be arbitrarily small.
Static charged perfect fluid spheres in general relativity
The study of the galaxy LD at high redshift is crucial for understanding the epoch of spheroid formation.
The cosmic evolution of the galaxy luminosity density
Our predictions indicate a peak in the SFR density at high redshift due to massive star formation in spheroids.
The cosmic evolution of the galaxy luminosity density
The factor CH, which is essentially the spheroidal halo component mass density, can now be introduced for simpliﬁcation.
Dark Matter in the Local Galactic Disk
In what follows we will also consider the special case of spheroids. A spheroid is an ellipsoid with two equal semi-axes.
The physics of rotational flattening and the point core model
By minimizing this energy we can ﬁnd out whether a system tends to be triaxial or spheroidal.
The physics of rotational flattening and the point core model
For small angular velocities the spheroidal case is known to be relevant [9, 21].
The physics of rotational flattening and the point core model
For k = 0 the spheroidal σ -mode and the triaxial τ -mode are degenerate (have the same frequency).
The physics of rotational flattening and the point core model
Dankova, Ts., and Rosensteel, G., Triaxial bifurcations of rapidly rotating spheroids, Am. J.
The physics of rotational flattening and the point core model
Figure 1: The function ψ(ξ ) of equation Eq. (45) which gives the dimensionless gravitational energy of a homogeneous spheroid with a central point mass.
The physics of rotational flattening and the point core model
The present mass and luminosity are low, within the range of dwarf spheroidals.
The Planetary Nebula population of the Sagittarius Dwarf Spheroidal Galaxy
Both contain old stars of very low abundances (which in dwarf irregulars show a more spheroidal-like distribution: Minniti & Zijlstra 1996).
The Planetary Nebula population of the Sagittarius Dwarf Spheroidal Galaxy
The main points of our study of the PNe population of the Sagittarius dwarf spheroidal galaxy can be summarized as follows. 1.
The Planetary Nebula population of the Sagittarius Dwarf Spheroidal Galaxy
Under assumptions concerning the anisotropy of the kinetic energy tensor and the geometry of the system, this relation can be used to estimate total dynamical masses of rotating and ﬂattened spheroids (Bender et al. 1992).
3D spectroscopy with VLT/GIRAFFE - II: Are Luminous Compact Galaxies merger remnants ?
We study the relation between nuclear massive black holes and their host spheroid gravitational potential.
On the Fueling of Massive Black Holes and the Properties of their Host Spheroids
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