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Embryogony :: Embryogony (n.) The formation of an embryo.

Dicyemata :: Dicyemata (n. pl.) An order of worms parasitic in cephalopods. They are remarkable for the extreme simplicity of their structure. The embryo exists in two forms.

Brain :: Brain (n.) The whitish mass of soft matter (the center of the nervous system, and the seat of consciousness and volition) which is inclosed in the cartilaginous or bony cranium of vertebrate animals. It is simply the anterior termination of the spinal cord, and is developed from three embryonic vesicles, whose cavities are connected with the central canal of the cord; the cavities of the vesicles become the central cavities, or ventricles, and the walls thicken unequally and become the three seg

Corcule :: Corcule (n.) The heart of the seed; the embryo or germ.

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

Caulicle :: Caulicle (n.) A short caulis or stem, esp. the rudimentary stem seen in the embryo of seed; -- otherwise called a radicle..

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..

Archenteron :: Archenteron (n.) The primitive enteron or undifferentiated digestive sac of a gastrula or other embryo. See Illust. under Invagination.

Blastema :: Blastema (n.) The structureless, protoplasmic tissue of the embryo; the primitive basis of an organ yet unformed, from which it grows..

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..

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

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..

Embryotic :: Embryotic (a.) Embryonic.

Embryologic :: Embryologic (a.) Alt. of Embryologica.

Oospere :: Oospere (n.) An analogous mass of protoplasm in the ovule of a flowering plant; an embryonic vesicle.

Allantoid :: Allantoid (n.) A membranous appendage of the embryos of mammals, birds, and reptiles, -- in mammals serving to connect the fetus with the parent; the urinary vesicle..

Embryo :: Embryo (n.) The germ of the plant, which is inclosed in the seed and which is developed by germination..

Enterocoele :: Enterocoele (n.) A perivisceral cavity which arises as an outgrowth or outgrowths from the digestive tract; distinguished from a schizocoele, which arises by a splitting of the mesoblast of the embryo..

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

Metamorphosis :: Metamorphosis (n.) A change in the form or function of a living organism, by a natural process of growth or development; as, the metamorphosis of the yolk into the embryo, of a tadpole into a frog, or of a bud into a blossom. Especially, that form of sexual reproduction in which an embryo undergoes a series of marked changes of external form, as the chrysalis stage, pupa stage, etc., in insects. In these intermediate stages sexual reproduction is usually impossible, but they ultimately pass into

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