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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..

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

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.

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..

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

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..

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

Dioecious :: Dioecious (a.) Having the sexes in two separate individuals; -- applied to plants in which the female flowers occur on one individual and the male flowers on another of the same species, and to animals in which the ovum is produced by one individual and the sperm cell by another; -- opposed to monoecious..

Ovule :: Ovule (n.) An ovum.

Morula :: Morula (n.) 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..

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

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

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

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.

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

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

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

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..

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