a type of grouse (= a bird with a fat body and feathers on its legs), found in mountain areas and in Arctic regions Topics Birdsc2雷鸟(栖息于山区和北极地区) More Like This Silent lettersSilent lettersWord Originlate 16th cent.: from Scottish Gaelic tàrmachan. The spelling with p- was introduced later, suggested by Greek words starting with pt-.