/ Dictionary / Index A agaricus: Meaning and Definition of Find definitions for: a•gar•i•cus Pronunciation: (u-gar'i-kus), [key] — pl. -cus•es. any mushroom of the genus Agaricus, comprising the meadow mushrooms and a commercially grown species, A. brunnescens. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: agaricus (Thesaurus) agaric mineral agarita 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