• WordNet 3.6
    • n topminnow freshwater fish of Central America having a long swordlike tail; popular aquarium fish
    • n topminnow small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control
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In literature:

The black-banded topminnow was not taken in the Arkansas River but was common in the Walnut and Grouse systems.
"Fishes of Chautauqua, Cowley and Elk Counties, Kansas" by Artie L. Metcalf