neuter

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Neither masculine nor feminine in gender.
• adjective Neither active nor passive; intransitive. Used of verbs.
• adjective Having undeveloped or nonfunctional sexual organs.
• adjective Having pistils and stamens that are nonfunctional or absent.
• adjective Castrated or spayed. Used of animals.
• adjective Androgynous or asexual.
• adjective Archaic Taking no side in a dispute; neutral.
• noun The neuter gender.
• noun A neuter word.
• noun A neuter noun.
• noun An androgynous or asexual person.
• noun A castrated animal.
• noun An insect that has undeveloped or nonfunctional sexual organs, such as a worker bee.
• noun Archaic One that is neutral in a dispute.
• transitive verb To castrate or spay.
• transitive verb To render ineffective or powerless.

from The Century Dictionary.

• Neither the one thing nor the other; not adhering to either party; taking no part with either side, as in a contention or discussion; neutral.
• In gram.:
• Of neither gender; neither masculine nor feminine: used when words are grammatically or formally distinguished as masculine, feminine, and neuter—a distinction made in English only in the pronouns he, she, it.
• Neither active nor passive; intransitive. Abbreviated n. and neuter
• In botany, same as neutral.
• In zoology, having no fully developed sex: as, neuter bees.
• noun A neutral.
• noun An animal of neither sex, and incapable of propagation; one of the imperfectly developed females of certain social insects, as ants and bees, which perform all the labors of the community; a worker. See cuts under bee, Atta, and Termes.
• noun In botany, a plant which has neither stamens nor pistils. See cut under neutral.
• noun In grammar, a noun of the neuter gender. Abbreviated n. and neuter

from the GNU version of the Collaborative International Dictionary of English.

• adjective Archaic Neither the one thing nor the other; on neither side; impartial; neutral.
• adjective Having a form belonging more especially to words which are not appellations of males or females; expressing or designating that which is of neither sex
• adjective Intransitive.
• adjective (Biol.) Having no generative organs, or imperfectly developed ones; sexless. See Neuter, n., 3.
• noun A person who takes no part in a contest; one who is either indifferent to a cause or forbears to interfere; a neutral.
• noun A noun of the neuter gender; any one of those words which have the terminations usually found in neuter words.
• noun An intransitive verb.
• noun (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.
• transitive verb 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective archaic Neither the one thing nor the other; on neither side; impartial; neutral.
• adjective grammar Having a form belonging more especially to words which are not appellations of males or females; expressing or designating that which is of neither sex.
• adjective grammar Intransitive
• adjective biology Having no generative organs, or imperfectly developed ones; sexless.
• noun grammar The neuter gender.
• noun grammar A noun of the neuter gender; any one of those words which have the terminations usually found in neuter words.
• noun biology 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; especially, 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.
• noun A person who takes no part in a contest; someone remaining neutral.
• noun grammar An intransitive verb or state-of-being verb.
• verb To remove sex organs from an animal to prevent it from having offspring; to castrate or spay, particularly as applied to domestic animals.