Etymology
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ptarmigan (n.)

bird of the grouse family, 1590s, from Gaelic tarmachan, a word of unknown origin. The unetymological pt- spelling (1680s) began in French and seems to be a mistaken Greek construction (perhaps based on pteron "wing").

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Definitions of ptarmigan

ptarmigan (n.)
large Arctic and subarctic grouse with feathered feet and usually white winter plumage;
From wordnet.princeton.edu