grammar in some languages :of or belonging to the class of words (called a gender) that ordinarily includes most of the words referring to things that are neither masculine nor feminine

[+ obj] to remove the sex organs from (an animal)

Neuter usually refers to the action of removing the sex organs from a male animal, while spay usually refers to the action of removing the sex organs from a female animal.

disapproving :to make (something) much less powerful or effective