falco rusticolus

From The Collaborative International Dictionary of English v.0.48:

Gyrfalcon \Gyr"fal`con\ (j[~e]r"f[add]`k'n), n. [OE. gerfaucon,
   OF. gerfaucon, LL. gyrofalco, perh. fr. L. gyrus circle +
   falco falcon, and named from its circling flight; or cf. E.
   gier-eagle. See Gyre, n., Falcon.] (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.]
   [1913 Webster]
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