Open English Wordnet
Nouns
(n)topminnow, poeciliid fish, poeciliid, live-bearersmall usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control
(n)swordtail, helleri, topminnow, Xyphophorus hellerifreshwater fish of Central America having a long swordlike tail; popular aquarium fish