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

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

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

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..

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

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

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..

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

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..

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

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

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

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.

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..

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

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..

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..

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

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