sackbut
nounA medieval instrument resembling the trombone.
nounA medieval musical instrument of the trumpet family, having a long bent tube with a movable slide so that the vibrating column of air could be varied in length and the pitch of the tone changed, as in the modern trombone.
nounA brass wind instrument, like a bass trumpet, so contrived that it can be lengthened or shortened according to the tone required; — said to be the same as the trombone.
nounA
a medieval musical instrument resembling a trombone