Search the Dictionary

Of or pertaining to an embryo; embryonal; rudimentary. Embryonic sac or vesicle (Bot.), the vesicle within which the embryo is developed in the ovule; -- sometimes called also amnios sac, and embryonal sac.

Polyembryonate.

That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals.

A bar of cartilage at the base of the embryonic fins of some fishes. It develops into the metapterygium. -- Ba*sip`ter*yg"i*al (, a.

ls. 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 segments, the fore-…

An embryonic cell which develops into a pigment cell.

A defect or malformation; esp., a fissure of the iris supposed to be a persistent embryonic cleft.

The act of conceiving in the womb; the initiation of an embryonic animal life. I will greaty multiply thy sorrow and thy conception. Gen. iii. 16.

erving to focus the rays of light. It consists of rodlike cells derived from the external embryonic epithelium.

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.

Having two modes of embryonic development.

A lack of common possessions, properties, or relationship. Community of embryonic structure reveals community of descent; but dissimilarity of embryonic development does not prove discommunity of descent. Darwin.

See under Embryonic.

Pertaining to an embryo, or the initial state of any organ; embryonic.

Embryonic.

Embryonic.

Embryonic; undeveloped. [R.]

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 Illu…

The process of invagination, in embryonic development, by which a gastrula is formed.

The primitive cell in certain embryonic forms. Balfour.