Etymology
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spheroid (n.)

"body resembling, but not identical with, a sphere," 1560s, from Latin sphaeroides, from Greek sphairoeides "ball-like, spherical," from sphaira (see sphere) + -oeides "form" (see -oid). As an adjective from 1767. Related: Spheroidal.

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Definitions of spheroid

spheroid (n.)
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
Synonyms: ellipsoid of revolution
From wordnet.princeton.edu