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Embryo Sac :: Embryo sac () See under Embryonic.

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..

Ossein :: Ossein (n.) The organic basis of bone tissue; the residue after removal of the mineral matters from bone by dilute acid; in embryonic tissue, the substance in which the mineral salts are deposited to form bone; -- called also ostein. Chemically it is the same as collagen..

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

Centripetal :: Centripetal (a.) Having the radicle turned toward the axis of the fruit, as some embryos..

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

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

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

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..

Myoepithelial :: Myoepithelial (a.) Derived from epithelial cells and destined to become a part of the muscular system; -- applied to structural elements in certain embryonic forms.

Develop :: Develop (v. i.) To go through a process of natural evolution or growth, by successive changes from a less perfect to a more perfect or more highly organized state; to advance from a simpler form of existence to one more complex either in structure or function; as, a blossom develops from a bud; the seed develops into a plant; the embryo develops into a well-formed animal; the mind develops year by year..

Embryo :: Embryo (n.) The young of an animal in the womb, or more specifically, before its parts are developed and it becomes a fetus (see Fetus)..

Macrocephalous :: Macrocephalous (a.) Having the cotyledons of a dicotyledonous embryo confluent, and forming a large mass compared with the rest of the body..

Development :: Development (n.) The series of changes which animal and vegetable organisms undergo in their passage from the embryonic state to maturity, from a lower to a higher state of organization..

Homosystemic :: Homosystemic (a.) Developing, in the case of multicellular organisms, from the same embryonic systems into which the secondary unit (gastrula or plant enbryo) differentiates..

Proembryo :: Proembryo (n.) The primary growth from the spore in certain cryptogamous plants; as, the proembryo, or protonema, of mosses..

Cotyledon :: Cotyledon (n.) A leaf borne by the caulicle or radicle of an embryo; a seed leaf.

Develop :: Develop (v. t.) To unfold gradually, as a flower from a bud; hence, to bring through a succession of states or stages, each of which is preparatory to the next; to form or expand by a process of growth; to cause to change gradually from an embryo, or a lower state, to a higher state or form of being; as, sunshine and rain develop the bud into a flower; to develop the mind..

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..

Tigella :: Tigella (n.) That part of an embryo which represents the young stem; the caulicle or radicle.

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