/ Dictionary / Index F fish louse: Meaning and Definition of Find definitions for: fish' louse" Pronunciation: [key] any of numerous small crustaceans, esp. certain copepods, parasitic on the skin and gills of fish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fishline fish meal Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language