Cock's-foot grass: A genus of the digynia order, belonging to the triandria clas of plants; and in the natural method ranking under the 4th order, Graminae. The calyx is bivalved and compressed, with the one valve longer than the other, carinated, or having the rachis prominent and sharp. There are two species, the cynosuroides or smooth cock's-foot grass, and the glomeratus or rough cock's-foot grass. Both are natives of Britain: the first grows in marshy places, and the latter is common in meadows and pasture-grounds. This last is eaten by horses, sheep, and goats; but refused by cows.