/ Dictionary / Index F frass: Meaning and Definition of Find definitions for: frass Pronunciation: (fras), [key] — n. insect excrement. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Fraser frat Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language