'gierfalcon' definitions:

Definition of 'gierfalcon'

From: GCIDE

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]