/ Dictionary / Index A apothem: Meaning and Definition of Find definitions for: ap•o•them Pronunciation: (ap'u-them"), [key] — n. Geom. a perpendicular from the center of a regular polygon to one of its sides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. apothegm apotheosis Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language