/ Dictionary / Index G grumous: Meaning and Definition of Find definitions for: gru•mous Pronunciation: (gr'mus), [key] — adj. formed of clustered grains or granules. having or resembling grume; clotted. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: grumous (Thesaurus) grummet grump 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