Source : Webster's Revised Unabridged Dictionary (1913)

Eunuch \Eu"nuch\, n. [L. eunuchus, Gr. ?, prop., keeping or
   guarding the couch; ? couch, bed, + ? to have, hold, keep.]
   A male of the human species castrated; commonly, one of a
   class of such persons, in Oriental countries, having charge
   of the women's apartments. Some of them, in former times,
   gained high official rank.

Eunuch \Eu"nuch\, Eunuchate \Eu"nuch*ate\, v. t. [L. eunuchare.]
   To make a eunuch of; to castrate. as a man. --Creech. Sir. T.
   Browne.

Source : WordNet®

eunuch
     n : a man who has been castrated and is incapable of
         reproduction; "eunuchs guarded the harem" [syn: {castrate}]