/ Dictionary / Index F formicarium: Meaning and Definition of Find definitions for: for•mi•car•i•um Pronunciation: (fôr"mi-kâr'ē-um), [key] — pl. -car•i•a formicary. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. formic acid formicary 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