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The germinal membrane in an ovum, from which the embryo is developed.

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-…

Having the ovules and seeds so curved, or bent down upon themselves, that the ends of the embryo are brought close together.

teeth of bivalve shell. See Bivalve. -- Cardinal veins (Anat.), the veins in vertebrate embryos, which run each side of the vertebral column and returm the blood to the heart. They remain through life in some fishes. -- Cardinal virtues, preëminent virtues; among the ancients, prudence, justice, temperance, and fort…

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

Having the radicle turned toward the sides of the fruit, as some embryos. Centrifugal force (Mech.), a force whose direction is from a center.

A process of fecundation in which the pollen tube penetrates to the embryosac through the tissue of the chalaza, instead of entering through the micropyle. It was originally discovered by Treub in Casuarina, and has since been found to occur regularly in the families Betulaceæ and Juglandaceæ. Partial chalazogamy is fo…

The embryo or the growing bud of a plant; a shoot; a sprout; as, the chits of Indian corn or of potatoes.

laginous; as, the chondrocranium, the cartilaginous skull of the lower vertebrates and of embryos.

An embryonic cell which develops into a pigment cell.

The germinating point in the embryo of a seed; the point in the yolk of an egg at which development begins.

A sheath in the embryo of grasses, inclosing the caulicle. Gray.

The first rudiments of an embryo in generation. Dr. H. More.

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

To receive into the womb and begin to breed; to begin the formation of the embryo of. She hath also conceived a son in her old age. Luke i. 36.

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.

The heart of the seed; the embryo or germ. [Obs.]

The embryological history of groups or families of individuals.

A leaf borne by the caulicle or radicle of an embryo; a seed leaf.

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