1. Castrate: 1 v remove the testicles of a male animal Synonyms: demasculinise , demasculinize , emasculate Types: caponise , caponize convert a cock into a capon cut , geld cut off the testicles (of male animals such as horses) Type of: desex , desexualise , desexualize , fix , sterilise , sterilize , unsex make infertile v remove the ovaries of