castrato
/kæˈstrɑːtəʊ/noun
(pl. castrati /-tɪ/ )
- historical a male singer castrated in boyhood so as to retain a soprano or alto voice. The practice of castration was banned in 1903.〈史〉阉人歌手（童年时期被阉割, 以保持其童声高音或男声最高音的男歌手; 1903年此种阉割行为被禁止）。
词源
mid 18th cent.: from Italian, past participle of castrare （see CASTRATE）.