From The Collaborative International Dictionary of English v.0.48:

Auk \Auk\, n. [Prov. E. alk; akin to Dan. alke, Icel. & Sw.
   alka.] (Zool.)
   A name given to various species of arctic sea birds of the
   family Alcid[ae]. The great auk, now extinct, is {Alca
   impennis} (or Plautus impennis) . The razor-billed auk is
   Alca torda. See Puffin, Guillemot, and Murre.
   [1913 Webster]
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