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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Micromere :: Micromere (n.) One of the smaller cells, or blastomeres, resulting from the complete segmentation of a telolecithal ovum..

Ovums :: Ovums (pl. ) of Ovu.

Incapsulation :: Incapsulation (n.) The process of becoming, or the state or condition of being, incapsulated; as, incapsulation of the ovum in the uterus..

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

Ectental :: Ectental (a.) Relating to, or connected with, the two primitive germ layers, the ectoderm and ectoderm; as, the ectental line or line of juncture of the two layers in the segmentation of the ovum..

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

Segment :: Segment (v. i.) To divide or separate into parts in growth; to undergo segmentation, or cleavage, as in the segmentation of the ovum..

Fecundate :: Fecundate (v. t.) To render fruitful or prolific; to impregnate; as, in flowers the pollen fecundates the ovum through the stigma..

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

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

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..

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

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

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.

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

Polyspermy :: Polyspermy (n.) Fullness of sperm, or seed; the passage of more than one spermatozoon into the vitellus in the impregnation of the ovum..

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..

Blastide :: Blastide (n.) A small, clear space in the segments of the ovum, the precursor of the nucleus..

Blastomere :: Blastomere (n.) One of the segments first formed by the division of the ovum.

Novum :: Novum (n.) A game at dice, properly called novem quinque (L., nine five), the two principal throws being nine and five..