fal·set·to 
(fôl-sĕtō)
(fôl-sĕtō)n. pl. fal·set·tos
1. A voice in a register higher than a person's usual register, resulting from a change in the way the vocal cords are vibrated.
2. One who sings or talks in this register.
[Italian, diminutive of falso, false, from Latin falsus; see FALSE.]
fal·setto adv.