What is the meaning of Eunuch?

A castrated human male.

Such a man employed as harem guard or in certain (mainly Eastern) monarchies (e.g. late Roman and Chinese Empires) as court or state officials.

A man who is not inclined to marry and procreate.

One that is ineffectual.

While the most common form is a eunuch, the form an eunuch (presumably with an appropriate pronunciation) is occasionally seen.

To castrate

To render ineffectual.

eunuch (castrated man)

a eunuch (castrated man)

a eunuch (castrated male harem guard)

eunuch (a castrated human male)

eunuch (a harem guard)

castrato, eunuch (castrated human male)

eunuch (such a man who was harem guard or in Middle Eastern courts under Roman Emperors, important officials of the state)

impotent (person incapable of taking a particular type of action that the situation requires)

Source: wiktionary.org