/pee sil"ee id/ , n.
1. any small New World fish of the family Poeciliidae, of fresh or brackish tropical and temperate waters, including the mosquitofish, guppies, and mollies.
adj.
2. belonging or pertaining to the family Poeciliidae.
[ Poeciliidae, equiv. to Poecili ( a ) name of genus ( poikilía striped, marked with various colors) + -idae -ID 2 ]