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Noun: topminnow  'tóp,mi-now
  1. Small usually brightly-coloured viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control
    - poeciliid fish, poeciliid, live-bearer
     
  2. Freshwater fish of Central America having a long swordlike tail; popular aquarium fish
    - swordtail, helleri, Xyphophorus helleri

Derived forms: topminnows

Type of: cypriniform fish, cyprinodont

Part of: family Poeciliidae, genus Xyphophorus, Poeciliidae, Xyphophorus

Encyclopedia: Topminnow

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