/ Dictionary / Index G gambusia: Meaning and Definition of Find definitions for: gam•bu•sia Pronunciation: (gam-by'zhu, -zhē-u, -zē-u), [key] — n. any fish of the genus Gambusia, comprising small livebearers that feed on aquatic insect larvae and are used to control mosquitoes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gambusia (Thesaurus) Gambrinus game 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