contraltos

n. [ It., fr. contra + alto. See Alto. ] (Mus.) (a) The part sung by the highest male or lowest female voices; the alto or counter tenor. (b) the voice or singer performing this part; as, her voice is a contralto; she is a contralto. [ 1913 Webster ]

☞ The usual range of the contralto voice is from G, below middle C, to the C above that; though exceptionally it embraces two octaves. [ 1913 Webster ]