English definition of Ovule

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Definition of ovule

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Ovule (n.) The rudiment of a seed. It grows from a placenta, and consists of a soft nucleus within two delicate coatings. The attached base of the ovule is the hilum, the coatings are united with the nucleus at the chalaza, and their minute orifice is the foramen..

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Placenta :: Placenta (n.) The part of a pistil or fruit to which the ovules or seeds are attached.

Ovulum :: Ovulum (n.) An ovule.

Oospore :: Oospore (n.) A fertilized oosphere in the ovule of a flowering plant.

Chalaza :: Chalaza (n.) The place on an ovule, or seed, where its outer coats cohere with each other and the nucleus..

Micropyle :: Micropyle (n.) An opening in the outer coat of a seed, through which the fecundating pollen enters the ovule..

Ovulary :: Ovulary (a.) Pertaining to ovules.

Apogamy :: Apogamy (n.) The formation of a bud in place of a fertilized ovule or oospore.

Quartine :: Quartine (n.) A supposed fourth integument of an ovule, counting from the outside..

Abortive :: Abortive (v.) Imperfectly formed or developed; rudimentary; sterile; as, an abortive organ, stamen, ovule, etc..

Spermaphore :: Spermaphore (n.) That part of the ovary from which the ovules arise; the placenta.

Hemitropous :: Hemitropous (a.) Having the raphe terminating about half way between the chalaza and the orifice; amphitropous; -- said of an ovule.

Pendulous :: Pendulous (a.) Inclined or hanging downwards, as a flower on a recurved stalk, or an ovule which hangs from the upper part of the ovary..

Campylotropous :: Campylotropous (a.) Having the ovules and seeds so curved, or bent down upon themselves, that the ends of the embryo are brought close together..

Proembryo :: Proembryo (n.) The series of cells formed in the ovule of a flowering plant after fertilization, but before the formation of the embryo..

Spore :: Spore (n.) An embryo sac or embryonal vesicle in the ovules of flowering plants.

Secundine :: Secundine (n.) The second coat, or integument, of an ovule, lying within the primine..

Endostome :: Endostome (n.) The foramen or passage through the inner integument of an ovule.

Pistil :: Pistil (n.) The seed-bearing organ of a flower. It consists of an ovary, containing the ovules or rudimentary seeds, and a stigma, which is commonly raised on an elongated portion called a style. When composed of one carpel a pistil is simple; when composed of several, it is compound. See Illust. of Flower, and Ovary..

Amphitropous :: Amphitropous (a.) Having the ovule inverted, but with the attachment near the middle of one side; half anatropous..

Anatropous :: Anatropous (a.) Having the ovule inverted at an early period in its development, so that the chalaza is as the apparent apex; -- opposed to orthotropous..