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.