SG Heritage Dictionary

Gyrfalcon [Noun] Webster's Dictionary 1828

1. [Latin hierofalco, from Gr. sacred, and falco, and so named from the veneration of the Egyptians for hawks.

2. A species of Falco, or hawk.

Gyrfalcon [Noun] Webster's Dictionary 1913

One of several species and varieties of large Arctic falcons, esp. Falco rusticolus and the white species F. Islandicus, both of which are circumpolar. The black and the gray are varieties of the former. See Illust. of Accipiter.