English definition of Ovum

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Definition of ovum

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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..

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Ovisac :: Ovisac (n.) A Graafian follicle; any sac containing an ovum or ova.

Deutoplasm :: 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..

Blastula :: 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.

Morulation :: Morulation (n.) The process of cleavage, or segmentation, of the ovum, by which a morula is formed..

Oosperm :: Oosperm (n.) The ovum, after fusion with the spermatozoon in impregnation..

Centrolecithal :: Centrolecithal (a.) Having the food yolk placed at the center of the ovum, segmentation being either regular or unequal..

Egg :: Egg (n.) A simple cell, from the development of which the young of animals are formed; ovum; germ cell..

Holoblast :: Holoblast (n.) an ovum composed entirely of germinal matter. See Meroblast.

Meroblast :: Meroblast (n.) 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..

Ova :: Ova (n. pl.) See Ovum.

Triploblastic :: 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..

Nucleoplasmic :: 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.

Blastoderm :: Blastoderm (n.) The germinal membrane in an ovum, from which the embryo is developed..

Delamination :: Delamination (n.) Formation and separation of laminae or layers; one of the methods by which the various blastodermic layers of the ovum are differentiated.

Ectoplasm :: Ectoplasm (n.) The outer transparent layer of protoplasm in a developing ovum.

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

Ovum :: 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..

Ovums :: Ovums (pl. ) of Ovu.

Ovum :: Ovum (n.) One of the series of egg-shaped ornaments into which the ovolo is often carved.

Blastosphere :: Blastosphere (n.) The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum.