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Notochord :: Notochord (n.) An elastic cartilagelike rod which is developed beneath the medullary groove in the vertebrate embryo, and constitutes the primitive axial skeleton around which the centra of the vertebrae and the posterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm..

Endogen :: Endogen (n.) A plant which increases in size by internal growth and elongation at the summit, having the wood in the form of bundles or threads, irregularly distributed throughout the whole diameter, not forming annual layers, and with no distinct pith. The leaves of the endogens have, usually, parallel veins, their flowers are mostly in three, or some multiple of three, parts, and their embryos have but a single cotyledon, with the first leaves alternate. The endogens constitute one of the grea

Embryo :: Embryo (a.) Pertaining to an embryo; rudimentary; undeveloped; as, an embryo bud..

Quintine :: Quintine (n.) The embryonic sac of an ovule, sometimes regarded as an innermost fifth integument. Cf. Quartine, and Tercine..

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

Measles :: Measles (n.) A disease of cattle and swine in which the flesh is filled with the embryos of different varieties of the tapeworm.

Coleorhiza :: Coleorhiza (n.) A sheath in the embryo of grasses, inclosing the caulicle..

Otocyst :: Otocyst (n.) An auditory cyst or vesicle; one of the simple auditory organs of many invertebrates, containing a fluid and otoliths; also, the embryonic vesicle from which the parts of the internal ear of vertebrates are developed..

Exalbuminous :: Exalbuminous (a.) Having no albumen about the embryo; -- said of certain seeds.

Embryological :: Embryological (a.) Of or pertaining to embryology.

Pseudonavicula :: Pseudonavicula (n.) One of the minute spindle-shaped embryos of Gregarinae and some other Protozoa.

Germogen :: Germogen (n.) The primitive cell in certain embryonic forms.

Gastrulation :: Gastrulation (n.) The process of invagination, in embryonic development, by which a gastrula is formed..

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..

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

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..

Nematogene :: Nematogene (n.) One of the dimorphic forms of the species of Dicyemata, which produced vermiform embryos; -- opposed to rhombogene..

Pseudofilaria :: Pseudofilaria (n.) One of the two elongated vibratile young formed by fission of the embryo during the development of certain Gregarinae.

Notorhizal :: Notorhizal (a.) Having the radicle of the embryo lying against the back of one of the cotyledons; incumbent.

Gastrula :: Gastrula (n.) An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double-walled sac, with one opening or mouth (the blastopore) which leads into the cavity (the archenteron) lined by the inner wall (the hypoblast). See Illust. under Invagination. In a more general sense, an ideal stage in embryonic development. See Gastraea..

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