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ovum
o v u m hex:#111;#118;#117;#109;
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- Ovum - n. - A more or less spherical and transparent mass of granular protoplasm, which by a process of multiplication and growth develops into a mass of cells, constituting a new individual like the parent; an egg, spore, germ, or germ cell. See Illust. of Mycropyle.
- Ovum - n. - One of the series of egg-shaped ornaments into which the ovolo is often carved.
- Ovums - pl. - of Ovum
- Impregnate - v. t. - To come into contact with (an ovum or egg) so as to cause impregnation; to fertilize; to fecundate.
- Metagenesis - n. - The change of form which one animal species undergoes in a series of successively produced individuals, extending from the one developed from the ovum to the final perfected individual. Hence, metagenesis involves the production of sexual individuals by nonsexual means, either directly or through intervening sexless generations. Opposed to monogenesis. See Alternate generation, under Generation.
- Blastula - n. - That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.
- Dioecious - a. - Having the sexes in two separate individuals; -- applied to plants in which the female flowers occur on one individual and the male flowers on another of the same species, and to animals in which the ovum is produced by one individual and the sperm cell by another; -- opposed to monoecious.
- Delamination - n. - Formation and separation of laminae or layers; one of the methods by which the various blastodermic layers of the ovum are differentiated.
- Fecundate - v. t. - To render fruitful or prolific; to impregnate; as, in flowers the pollen fecundates the ovum through the stigma.
- Prefecundation - n. - A term collectively applied to the changes or conditions preceding fecundation, especially to the changes which the ovum undergoes before fecundation.
- Morula - n. - The sphere or globular mass of cells (blastomeres), formed by the clevage of the ovum or egg in the first stages of its development; -- called also mulberry mass, segmentation sphere, and blastosphere. See Segmentation.
- Ovisac - n. - A Graafian follicle; any sac containing an ovum or ova.
- Triploblastic - a. - Of, pertaining to, or designating, that condition of the ovum in which there are three primary germinal layers, or in which the blastoderm splits into three layers.
- Embryology - n. - The science which relates to the formation and development of the embryo in animals and plants; a study of the gradual development of the ovum until it reaches the adult stage.
- Invagination - n. - One of the methods by which the various germinal layers of the ovum are differentiated.
- Incapsulation - n. - The process of becoming, or the state or condition of being, incapsulated; as, incapsulation of the ovum in the uterus.
- Holoblast - n. - an ovum composed entirely of germinal matter. See Meroblast.
- Deutoplasm - n. - The lifeless food matter in the cytoplasm of an ovum or a cell, as distinguished from the active or true protoplasm; yolk substance; yolk.
- Diploblastic - a. - Characterizing the ovum when it has two primary germinal layers.
- Nucleoplasmic - a. - Of or pertaining to nucleoplasm; -- esp. applied to a body formed in the developing ovum from the plasma of the nucleus of the germinal vesicle.