**Sphe"roid** (?), n. [L. *spheroides* ball-like, spherical, Gr. ; sphere + form: cf. F. *sph'eroide*.]

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.

Oblate spheroid, Prolate spheroid. See Oblate, Prolate, and Ellipsoid.

© Webster 1913.