al·pen·horn 
(ălpən-hôrn′) or alp·horn (ălphôrn′)
(ălpən-hôrn′) or alp·horn (ălphôrn′)n.
A curved wooden horn, sometimes as long as 6 meters (20 feet), traditionally used by herders in the Alps to call cows to pasture.
[German : Alpen, Alps + Horn, horn (from Middle High German, from Old High German; see ker-1 in the Appendix of Indo-European roots).]
alpenhorn