Tre″ble (?), a. [OE. treble threefold, OF. treble, treible, L. triplus. See Triple.] 1. Threefold; triple.
A lofty tower, and strong on every side
With treble walls. Dryden.
2. (Mus.) (a) Acute; sharp; as, a treble sound. Bacon. (b) Playing or singing the highest part or most acute sounds; playing or singing the treble; as, a treble violin or voice.