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Polygeny :: Polygeny (n.) The theory that living organisms originate in cells or embryos of different kinds, instead of coming from a single cell; -- opposed to monogenesis..

Rudimentary :: Rudimentary (a.) Very imperfectly developed; in an early stage of development; embryonic.

Albumen :: Albumen (n.) Nourishing matter stored up within the integuments of the seed in many plants, but not incorporated in the embryo. It is the floury part in corn, wheat, and like grains, the oily part in poppy seeds, the fleshy part in the cocoanut, etc..

Uterus :: Uterus (n.) A receptacle, or pouch, connected with the oviducts of many invertebrates in which the eggs are retained until they hatch or until the embryos develop more or less. See Illust. of Hermaphrodite in Append..

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

Perisperm :: Perisperm (n.) The albumen of a seed, especially that portion which is formed outside of the embryo sac..

Seed :: Seed (n.) A ripened ovule, consisting of an embryo with one or more integuments, or coverings; as, an apple seed; a currant seed. By germination it produces a new plant..

Hyaline :: Hyaline (n.) The pellucid substance, present in cells in process of development, from which, according to some embryologists, the cell nucleous originates..

Chromoblast :: Chromoblast (n.) An embryonic cell which develops into a pigment cell.

Rhombogene :: Rhombogene (n.) A dicyemid which produces infusorialike embryos; -- opposed to nematogene. See Dicyemata.

Myotome :: Myotome (n.) One of the embryonic muscular segments arising from the protovertebrae; also, one of the protovertebrae themselves..

Metanephros :: Metanephros (n.) The most posterior of the three pairs of embryonic renal organs developed in many vertebrates.

Zoology :: Zoology (n.) That part of biology which relates to the animal kingdom, including the structure, embryology, evolution, classification, habits, and distribution of all animals, both living and extinct..

Radicle :: Radicle (n.) The rudimentary stem of a plant which supports the cotyledons in the seed, and from which the root is developed downward; the stem of the embryo; the caulicle..

Proembryo :: Proembryo (n.) The series of cells formed in the ovule of a flowering plant after fertilization, but before the formation of the embryo..

Endorhizous :: Endorhizous (a.) Having the radicle of the embryo sheathed by the cotyledon, through which the embryo bursts in germination, as in many monocotyledonous plants..

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

Allantoidea :: Allantoidea (n. pl.) The division of Vertebrata in which the embryo develops an allantois. It includes reptiles, birds, and mammals..

Planula :: Planula (n.) In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. Sometimes used as synonymous with gastrula..

Pseudembryo :: Pseudembryo (n.) An asexual form from which the true embryo is produced by budding.

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