'Castrato' definitions:

Definition of 'castrato'

From: WordNet
noun
A male singer who was castrated before puberty and retains a soprano or alto voice

Definition of 'Castrato'

From: GCIDE
  • Castrato \Cas*tra"to\, n. [L., properly p. p. of castrare. See Castrate.] A male person castrated for the purpose of improving his voice for singing; an artificial, or male, soprano. --Swift. [1913 Webster]