falsetto
/fɔːlˈsetəʊ/(pl. -os)
1- Music a method of voice production used by male singers, especially tenors, to sing notes higher than their normal range【乐】（尤指男高音歌手用的）假声：
he sang in a piercing falsetto
他用刺耳的假声唱歌
mass noun he was singing falsetto in this role.他唱这个角色时用的是假声。
1.1
- a singer using this method采用假声的歌手。
1.2
- a voice or sound that is unusually or unnaturally high异常（或不自然）的高嗓音（或声音）。
词源
late 18th cent.: from Italian, diminutive of falso 'false', from Latin falsus （see FALSE）.