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ives rise to a mass of cells, which ultimately form a new individual like the parent. See Ovum. -- Germ gland. (Anat.) See Gonad. -- Germ stock (Zoöl.), a special process on which buds are developed in certain animals. See Doliolum. -- Germ theory (Biol.), the theory that living organisms can be produced only by the…

nal membrane. (Biol.) Same as Blastoderm. -- Germinal spot (Biol.), the nucleolus of the ovum. -- Germinal vesicle, (Biol.) , the nucleus of the ovum of animals.

an ovum composed entirely of germinal matter. See Meroblast.

To come into contact with (an ovum or egg) so as to cause impregnation; to fertilize; to fecundate.

The fusion of a female germ cell (ovum) with a male germ cell (in animals, a spermatozoön) to form a single new cell endowed with the power of developing into a new individual; fertilization; fecundation.

s of becoming, or the state or condition of being, incapsulated; as, incapsulation of the ovum in the uterus.

One of the methods by which the various germinal layers of the ovum are differentiated.

and muscle. (c) (Biol.) One of those periods or resting stages in the development of the ovum, in which development is arrested prior to renewed activity.

An ovum, as that of a mammal, only partially composed of germinal matter, that is, consisting of both a germinal portion and an albuminous or nutritive one; -- opposed to holoblast.

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 generat…

smaller cells, or blastomeres, resulting from the complete segmentation of a telolecithal ovum.

An opening in the membranes surrounding the ovum, by which nutrition is assisted and the entrance of the spermatozoa permitted.

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.

The process of cleavage, or segmentation, of the ovum, by which a morula is formed.

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.

The ovum, after fusion with the spermatozoön in impregnation. Balfour.

conducted; -- a term adopted from the Aristotelian writers by Lord Bacon, as the title ("Novum Organon") of part of his treatise on philosophical method. Sir. W. Hamilton.

See Ovum.

A Graafian follicle; any sac containing an ovum or ova.

An ovum.