alto
/ˈæltəu; `ælto/ n
(pl ~s) (music 音)
1 (singer with a) voice of the highest adult male pitch 男声最高音（歌手）.
2 = contralto.
3 part written for the alto voice 中音部.
4 musical instrument with the second highest pitch in its group 中音乐器
an alto-saxophone 中音萨克斯管.