/ Dictionary / Index S sphenopsid: Meaning and Definition of Find definitions for: sphe•nop•sid Pronunciation: (sfi-nop'sid), [key] — n. equisetoid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sphenoid spheral Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language