ALTHORN Meaning of ALTHORN in English [ 'althɔ:n ]■ noun a musical instrument of the saxhorn family, especially the alto or tenor saxhorn in E flat.OriginC19: from Ger., from alt 'high' (from L. altus ) + Horn 'horn'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004