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

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

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

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

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

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

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

Prefecundation :: Prefecundation (n.) A term collectively applied to the changes or conditions preceding fecundation, especially to the changes which the ovum undergoes before fecundation..

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

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

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.

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.

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..

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

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

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..

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..

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

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

Entoplasm :: Entoplasm (n.) The inner granular layer of protoplasm in a developing ovum.