Definitions
1.NounA male who has been castrated, especially a male whose testicles have been removed before puberty in order to retain his boyish voice.
2.NounA male soprano or alto voice produced by castration of the treble singer before puberty, intended to conserve his voice; the singer.
3.AdjectiveCastrated; especially castrated prepubescently.
4.AdjectiveHaving, using or containing the voice of a castrato (noun).
5.AdjectiveOriginally composed for a castrato."Nowadays, either women or countertenors take the castrato roles."