bitterling

noun
bit·​ter·​ling | \ˈbitə(r)liŋ\
plural -s

Definition of bitterling 

: a small European cyprinid fish (Rhodeus amarus) introduced and locally common about New York that is much used in bioassay of mammalian hormones — see bitterling test, japanese bitterling

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History and Etymology for bitterling

German, from bitter (from Old High German bittar) + -ling

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