Noun aythya has 1 sense
  1. Aythya, genus Aythya - canvasback; redhead; pochard; etc.
    --1 is a kind of bird genus
    --1 is a member of Anatidae, family Anatidae
    --1 has members:
     canvasback, canvasback duck, Aythya valisineria; pochard, Aythya ferina; redhead, Aythya americana; scaup, scaup duck, bluebill, broadbill
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