Etymology
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ellipsoid (n.)

in geometry, "a solid figure, all planes of which are ellipses or circles," 1721; see ellipse + -oid. From 1861 as an adjective (earlier adjective was ellipsoidal, 1831).

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Definitions of ellipsoid
1
ellipsoid (n.)
a surface whose plane sections are all ellipses or circles;
the Earth is an ellipsoid
2
ellipsoid (adj.)
having the nature or shape of an ellipsoid;
Synonyms: ellipsoidal / spheroidal
From wordnet.princeton.edu