Evirate is a lesser-known word that means to castrate or to remove a male's ability to reproduce. There are several other words that can be used as synonyms for evirate, including geld, emasculate, and castrate. Gelding is the act of removing a male horse's testicles, while emasculate means to remove a male's strength or power. The word castrate is often associated with removing a male's testicles, but can also refer to the removal of other organs that play a role in reproduction. All in all, these words are used to describe the process of removing the reproductive ability of a male, either through surgical or chemical means.