Definitions for gambusiagæmˈbyu ʒə, -ʒi ə
Random House Webster's College Dictionary
gam•bu•siagæmˈbyu ʒə, -ʒi ə(n.)(pl.)-sias.
any fish of the genus Gambusia, comprising small livebearers that feed on aquatic insect larvae and are used to control mosquitoes.
Origin of gambusia:
1900–05; < NL, alter. of Cuban Sp gambusino; see -ia
Gambusia, genus Gambusia(noun)
Any of several freshwater fish, of the genus Gambusia, that feed on the larva of mosquitos, and are used to control them