An Etymological Dictionary of the German Language/Annotated/Posaune
Posaune, feminine, ‘trumpet, trombone’; a loan-word, as is indicated by the accent; it is met even during the Middle High German period as busûne, basûne, bosûne. On account of the remarkable variant busîne the word has been derived from Old French buisine, which, like Italian búccina, ‘trumpet,’ is based on Latin bûcī̆na. Compare further Dutch bazuin, ‘trumpet.’