neuter (adj.)

late 14c., neutre, in grammar, of nouns, pronouns, etc., "neither masculine nor feminine in gender," also of verbs, "having middle or reflexive meaning, neither active nor passive," from Latin neuter "of the neuter gender," literally "neither one nor the other," from ne- "not, no" (from PIE root *ne- "not") + uter "either (of two)" (see whether). The Latin word is probably a loan-translation of Greek oudeteros "neither, neuter." From 1520s it also had the sense of "taking neither side" which now generally goes with neutral (adj.).

As a noun from mid-15c., "the neuter gender;" by 1797 of certain animals (among bees, ants, etc.) that are of neither sex and incapable of generation.

neuter (v.)

"castrate, render (a male) incapable of generation," 1893, in reference to dogs, from neuter (adj.). Related: Neutered; neutering.

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Definitions of neuter from WordNet
neuter (adj.)
of grammatical gender;
`it' is the third-person singular neuter pronoun
neuter (adj.)
having no or imperfectly developed or nonfunctional sex organs;
Synonyms: sexless
neuter (v.)
remove the ovaries of;
Synonyms: alter / spay / castrate
neuter (n.)
a gender that refers chiefly (but not exclusively) to inanimate objects (neither masculine nor feminine);