neuter

n. 1. A person who takes no part in a contest; one who is either indifferent to a cause or forbears to interfere; a neutral. [ 1913 Webster ]

The world's no neuter; it will wound or save. Young. [ 1913 Webster ]

2. (Gram.) (a) A noun of the neuter gender; any one of those words which have the terminations usually found in neuter words. (b) An intransitive verb. [ 1913 Webster ]

3. (Biol.) An organism, either vegetable or animal, which at its maturity has no generative organs, or but imperfectly developed ones, as a plant without stamens or pistils, as the garden Hydrangea; esp., one of the imperfectly developed females of certain social insects, as of the ant and the common honeybee, which perform the labors of the community, and are called workers. [ 1913 Webster ]

v. t. To render incapable of sexual reproduction; to remove or alter the sexual organs so as to make infertile; to alter; to fix; to desex; -- in male animals, to castrate; in female animals, to spay. [ PJC ]

adj. Deprived of sexual capacity or sexual attributes.
Syn. -- altered, castrated, unsexed, fixed, apayed, desexed. [ WordNet 1.5 ]