| minnow | (noun) very small European freshwater fish common in gravelly streams | Synonyms: Phoxinus phoxinus |
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| topminnow | (noun) small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control | Synonyms: live-bearer, poeciliid, poeciliid fish |
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| (noun) freshwater fish of Central America having a long swordlike tail; popular aquarium fish | Synonyms: helleri, swordtail, Xyphophorus helleri |
| winnow | (noun) the act of separating grain from chaff | Synonyms: sifting, winnowing |
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