to deprive (somebody or something) of effectiveness or strength, vigour, or spirit
to castrate
to rob (a man) of his male identity or role
to castrate (a male person or animal)
to remove the male representative organs of (a flower) to prevent self-pollination and allow artificial pollination
emasculation /-ʹlaysh(ə)n/ noun
emasculator noun
emasculatory /-lətri/ adj
[Latin emasculatus, past part. of emasculare, from ex-1 + masculus male]