Answer: alpenhorn

AnswerCrossword Clue
ALPENHORNSwiss signaling instrument.
ALPENHORNSwiss herder's instrument
alpenhornlong, powerful horn of wood or bark, with a cupped mouthpiece and a curved bell at opposite ends, used by Swiss herders and mountaineers
alpenhorn(German) a long powerful horn made of wood, used by Alpine cowherds also ALPHORN