1. (noun)topminnow, poeciliid fish, poeciliid, live-bearer small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control
2. (noun)swordtail, helleri, topminnow, Xyphophorus helleri freshwater fish of Central America having a long swordlike tail; popular aquarium fish
Definition of 'topminnow'
