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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Gyr·fal·con n.  Zool. One of several species and varieties of large Arctic falcons, esp. Falco rusticolus and the white species Falco Islandicus, both of which are circumpolar.  The black and the gray are varieties of the former.  See Illust. of Accipiter. [Written also gerfalcon, gierfalcon, and jerfalcon.]
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From: WordNet (r) 2.0

 Falco rusticolus
      n : large and rare arctic falcon having white and dark color
          phases [syn: gyrfalcon, gerfalcon]