n. A male who has been castrated, especially a male whose testicles have been removed before puberty in order to retain his boyish voice.n. A male soprano or alto voice produced by castration of the treble singer before puberty, intended to conserve his voice; the singer.adj. Castrated; especially castrated prepubescently.adj. Having, using or containing the voice of a castrato (noun).adj. Originally composed for a castrato.