mezzo-soprano
noun
mez·zo-so·pra·no ˌmet-(ˌ)sō-sə-ˈpra-(ˌ)nō 
-ˈprä-,
ˌmed-(ˌ)zō-
: a woman's voice with a range between soprano and contralto
also : a singer having this voice
Word History
Etymology
Italian mezzosoprano, from mezzo + soprano soprano
First Known Use
1838, in the meaning defined above