Eunuch - Vine's Expository Dictionary of New Testament Words
Eunuch[ A-1,Noun,G2135, eunouchos ]
(a) an emasculated man, a eunuch," Matthew 19:12;
(b) in the 3rd instance in that verse, "one naturally incapacitated for, or voluntarily abstaining from, wedlock;"
(c) one such, in a position of high authority in a court, "a chamberlain," Acts 8:27-Acts 8:39.
[ B-1,Verb,G2134, eunouchizo ]
"to make a eunuch" (from A), is used in Matthew 19:12, as under
(b) in A; and in the Passive Voice, "were made eunuchs," probably an allusion by the Lord to the fact that there were eunuchs in the courts of the Herods, as would be well known to His hearers.