noun
Etymology: Middle English faucon peregrin, translation of Medieval Latin falco peregrinus
: a swift falcon ( Falco peregrinus ) much used in falconry that is of almost cosmopolitan distribution and has adult plumage which is dark bluish ash on the back, nearly black on the head and cheeks, white beneath, and barred with black below the throat — compare duck hawk , 1, peale's falcon
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