GNU Collaborative International Dictionary of English

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1.       
   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 Alcidæ. 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