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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Metagenesis :: 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..

Tritovum :: Tritovum (n.) An embryonic insect which has twice cast its skin previous to hatching from the egg.

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

Perivitelline :: Perivitelline (a.) Situated around the vitellus, or between the vitellus and zona pellucida of an ovum..

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

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.

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

Pronucleus :: Pronucleus (n.) One of the two bodies or nuclei (called male and female pronuclei) which unite to form the first segmentation nucleus of an impregnated ovum.

Pseudovum :: Pseudovum (n.) An egglike germ produced by the agamic females of some insects and other animals, and by the larvae of certain insects. It is capable of development without fertilization. See Illust. of Paedogenesis..

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

Vitellus :: Vitellus (n.) The contents or substance of the ovum; egg yolk. See Illust. of Ovum.

Embryology :: 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 :: Invagination (n.) One of the methods by which the various germinal layers of the ovum are differentiated.

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

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

Micropyle :: Micropyle (n.) An opening in the membranes surrounding the ovum, by which nutrition is assisted and the entrance of the spermatozoa permitted..

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

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

Diploblastic :: Diploblastic (a.) Characterizing the ovum when it has two primary germinal layers.