Learner's definition of BAGPIPE
: a musical instrument that is played especially in Scotland and that has a bag, a tube for blowing air into the bag, and pipes where the air leaves and makes sounds
◊ The musical instrument is usually referred to by the plural bagpipes.
In U.S. English, the singular bagpipe is also used.
In both U.S. and British English, bagpipe is sometimes used before another noun.