top·min·now /ˈtɑpˌmɪ(ˌ)no/
  topminnow
       n 1: small usually brightly-colored viviparous surface-feeding
            fishes of fresh or brackish warm waters; often used in
            mosquito control [syn: poeciliid fish, poeciliid, live-bearer]
       2: freshwater fish of Central America having a long swordlike
          tail; popular aquarium fish [syn: swordtail, helleri,
          Xyphophorus helleri]