I. fȯl-ˈse-(ˌ)tō noun
( plural -tos )
Etymology: Italian, from diminutive of falso false, from Latin falsus
Date: 1721
1. : an artificially high voice ; especially : an artificially produced singing voice that overlaps and extends above the range of the full voice especially of a tenor
2. : a singer who uses falsetto
II. adverb
Date: 1940
: in falsetto