Tre″ble, n. [“ It has been said to be a corruption of triplum, a third part, superadded to the altus and bassus (high and low).” Grove.] (Mus.) The highest of the four principal parts in music; the part usually sung by boys or women; soprano.
☞ This is sometimes called the first treble, to distinguish it from the second treble, or alto, which is sung by lower female voices.