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Undifferentiated :: Undifferentiated (a.) Not differentiated; specifically (Biol.), homogenous, or nearly so; -- said especially of young or embryonic tissues which have not yet undergone differentiation (see Differentiation, 3), that is, which show no visible separation into their different structural parts..

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

Embryonated :: Embryonated (a.) In the state of, or having, an embryonal..

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)..

Embryogenic :: Embryogenic (a.) Pertaining to the development of an embryo.

Plumule :: Plumule (n.) The first bud, or gemmule, of a young plant; the bud, or growing point, of the embryo, above the cotyledons. See Illust. of Radicle..

Basisphenoidal :: Basisphenoidal (a.) Of or pertaining to that part of the base of the cranium between the basioccipital and the presphenoid, which usually ossifies separately in the embryo or in the young, and becomes a part of the sphenoid in the adult..

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

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

Kenogenesis :: Kenogenesis (n.) Modified evolution, in which nonprimitive characters make their appearance in consequence of a secondary adaptation of the embryo to the peculiar conditions of its environment; -- distinguished from palingenesis..

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..

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

Wolffian :: Wolffian (a.) Discovered, or first described, by Caspar Friedrich Wolff (1733-1794), the founder of modern embryology..

Cormogeny :: Cormogeny (n.) The embryological history of groups or families of individuals.

Stomp :: Stomodaeum (n.) The primitive mouth and esophagus of the embryo of annelids and arthropods.

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

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

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

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..

Conceive :: Conceive (v. t.) To receive into the womb and begin to breed; to begin the formation of the embryo of.

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