Pi"broch (?), n. [Gael. piobaireachd pipe music, fr. piobair a piper, fr. pioba pipe, bagpipe, from English. See Pipe, n.] A Highland air, suited to the particular passion which the musician would either excite or assuage; generally applied to those airs that are played on the bagpipe before the Highlanders when they go out to battle. Jamieson.