topminnow

Noun	1.	topminnow - small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control live-bearer, poeciliid, poeciliid fish cypriniform fish - a soft-finned fish of the order Cypriniformes family Poeciliidae, Poeciliidae - topminnows Gambusia affinis, mosquitofish - silvery topminnow with rows of black spots of tropical North America and West Indies; important in mosquito control platy, Platypoecilus maculatus - small stocky Mexican fish; popular aquarium fish mollie, molly - popular aquarium fish
	2.	topminnow - freshwater fish of Central America having a long swordlike tail; popular aquarium fish helleri, swordtail, Xyphophorus helleri cyprinodont - any member of the family Cyprinodontidae genus Xyphophorus, Xyphophorus - swordtails

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