岩雷鸟 yánléiniǎo rock ptarmigan Origin Definitions Defs Strokes Stroke Words Sentences Sents 岩 yán noun rock (geology) rock; mineral aggregate that makes up the earth's crust雷鸟 雷鳥 léiniǎo ptarmigan ptarmigan; any of several species of grouse in the genus Lagopus that live in cold high-altitude or arctic regions and change feather color with the seasons