alto

noun

1.
a singer whose voice lies in the alto clef
2.
the lowest female singing voice
contralto
Derived from:
alto
3.
the highest adult male singing voice
countertenor
Derived from:
alto
4.
(of a musical instrument) the second highest instrument in a family of musical instruments
Derived from:
alto
5.
the pitch range of the lowest female voice
Derived from:
alto