Webster's Revised Unabridged Dictionary (1913 + 1828)
result(s) from the 1913
Ptar"mi*gan (?), n. [Gael. tarmachan; cf. Ir. tarmochan, tarmonach.] (Zoöl.) Any grouse of the genus Lagopus, of which numerous species are known. The feet are completely feathered. Most of the species are brown in summer, but turn white, or nearly white, in winter.
&hand; They chiefly inhabit the northern countries and high mountains of Europe, Asia, and America. The common European species is Lagopus mutus. The Scotch grouse, red grouse, or moor fowl (L. Scoticus), is reddish brown, and does not turn white in winter. The white, or willow, ptarmigan (L. albus) is found in both Europe and America.
result(s) from the 1828
PT`ARMIGAN, n. A fowl of the genus Tetrao,the lagopus or white game. The color of the plumage is a pale brown or ash, elegantly crossed or mottled with dusky spots and minute bars; the belly and wings are white. This fowl is seen on the summits of mountains in the north of England and of Scotland.