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Related to gyrfalcon: peregrine falcon
gyr·fal·conalso gerfalcon (jûr′făl′kən, -fôl′-, -fô′-)
A large black, gray, or white falcon (Falco rusticolus) that breeds in Arctic and subarctic regions and sometimes migrates to northern North America and Eurasia. It is highly valued in falconry.
[Middle English girfaucoun, from Old French girfaut, gerfaucon : Old High German gīr, vulture + Old French faucon, falcon; see falcon.]
gyrfalcon(ˈdʒɜːˌfɔːlkən; -ˌfɔːkən) or
(Animals) a very large rare falcon, Falco rusticolus, of northern and arctic regions: often used for hunting
[C14: from Old French gerfaucon, perhaps from Old Norse geirfalki, from geirr spear + falki falcon]
gyr•fal•con(ˈdʒɜrˌfɔl kən, -ˌfæl-, -ˌfɔ kən)
a large falcon, Falco rusticolus, of arctic and subarctic regions, having white to dark color phases.