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