/ Dictionary / Index T toroid: Meaning and Definition of Find definitions for: to•roid Pronunciation: (tôr'oid, tōr'-), [key] — n. Geom. a surface generated by the revolution of any closed plane curve or contour about an axis lying in its plane. the solid enclosed by such a surface. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: toroid (Thesaurus) toro* toroidal Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language