countertenor
 US /ˈkaʊn.t̬ɚˌten.ɚ/
 UK /ˈkaʊn.t̬ɚˌten.ɚ/

1. 
a male singer who sings in the alto or soprano range using falsetto voice
:
• 
The opera featured a brilliant countertenor in the lead role.
• 
His voice, a clear countertenor, filled the concert hall.