/ ˈjuːnək; NAmE / noun
1.
a man who has been castrated , especially one who guarded women in some Asian countries in the past
2.
( formal ) a person without power or influence :
a political eunuch
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WORD ORIGIN
Old English , via Latin from Greek eunoukhos , literally bedroom guard, from eunē bed + a second element related to ekhein to hold.