[sfeer-oid] Geometry.
a solid geometrical figure similar in shape to a sphere, as an ellipsoid. See diag. under prolate.

1655–65; < Latin sphaeroīdēs < Greek sphairoeidḗs. See sphere, -oid

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World English Dictionary
spheroid (ˈsfɪərɔɪd)
1.  maths another name for ellipsoid of revolution
2.  shaped like but not exactly a sphere

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American Heritage
Medical Dictionary

spheroid spher·oid (sfēr'oid', sfěr'-) or sphe·roi·dal (sfĭ-roid'l)
Having a generally spherical shape.

spher'oid' n.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
spheroid   (sfîr'oid')  Pronunciation Key 
A three-dimensional geometric surface generated by rotating an ellipse on or about one of its axes.
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Example sentences
Nor would the fact that you don't know the difference between a astronomical spheroid and a bowling ball.
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