1620s, agent noun from emasculate.
c.1600, from Latin emasculatus, past participle of emasculare "castrate," from ex- "out, away" (see ex-) + masculus "male, manly" (see masculine). Originally and usually in a figurative sense. Related: Emasculated; emasculating.
emasculation e·mas·cu·la·tion (ĭ-mās'kyə-lā'shən)n. The surgical removal of the testes and penis; castration.