eunuch: [15] Eunuch has no etymological connection with ‘castration’. It is simply the fact that in former times male harem attendants in Oriental courts had their testicles removed, to ensure that they were not distracted from their work, that has led ultimately to the equation of eunuch with ‘castrated man’. Literally, the word means ‘bed-guard’; it comes via Latin from Greek eunoukhos, a compound formed from euné ‘bed’ and ékhein ‘have charge of, keep’. [eunuch etymology, eunuch origin, 英语词源]