ovary

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

• noun One of the paired female reproductive organs that produce eggs and female sex hormones in humans and other vertebrates.
• noun An analogous gland in an invertebrate animal, such as a flatworm or a mollusk.
• noun Botany The ovule-bearing lower part of a pistil that ripens into a fruit.

from The Century Dictionary.

• noun That part of a female animal in which ova, eggs, or germs are generated and matured; the essential female organ of reproduction, corresponding to the testes of the male; the female genital gland or germ-gland; the ovarium.
• noun In botany, a closed case or receptacle, the lower section of the pistil, inclosing the ovules or young seeds, and ultimately becoming the fruit.
• Of or pertaining to an ovation.

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

• noun (Bot.) That part of the pistil which contains the seed, and in most flowering plants develops into the fruit. See Illust. of flower.
• noun (Zoöl. & Anat.) The essential female reproductive organ in which the ova are produced. See Illust. of Discophora.

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

• noun anatomy A female reproductive organ, often paired, that produces ova and in mammals secretes the hormones estrogen and progesterone.
• noun botany The lower part of a pistil or carpel that bears ovules and ripens into fruit.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the organ that bears the ovules of a flower
• noun (vertebrates) one of usually two organs that produce ova and secrete estrogen and progesterone