Why is the ninth month called September?
late 14c., of grammatical gender, "neither masculine nor feminine," from Latin neuter "of the neuter gender," literally "neither one nor the other," from ne- "not, no" (see un-) + uter "either (of two)" (see whether). Probably a loan-translation of Greek oudeteros "neither, neuter." In 16c., it had the sense of "taking neither side, neutral."
1903, from neuter (adj.). Originally in reference to pet cats. Related: Neutered; neutering.
neuter neu·ter (nōō'tər, nyōō'-)
Having undeveloped or imperfectly developed sexual organs.