Search the Dictionary

The science which relates to the formation and development of the embryo in animals and plants; a study of the gradual development of the ovum until it reaches the adult stage.

Growth from within; multiplication of cells by endogenous division, as in the development of one or more cells in the interior of a parent cell.

elope Increase the capability of some type of machine or system; -- usu. by technological development.

luences, or forces, by which living forms are influenced and modified in their growth and development. It is no friendly environment, this of thine. Carlyle.

A stage in the development of discophorous medusæ, when they first begin to swim about after being detached from the strobila. See Strobila.

The act of unfolding or unrolling; hence, in the process of growth; development; as, the evolution of a flower from a bud, or an animal from the egg.

or tumor; anything growing out unnaturally from anything else; a preternatural or morbid development; hence, a troublesome superfluity; an incumbrance; as, an excrescence on the body, or on a plant. "Excrescences of joy." Jer. Taylor. The excrescences of the Spanish monarchy. Addison.

exponent is unknown or variable, as ax. -- Exponential series, a series derived from the development of exponential equations or quantities.

sms, either animal or vegetable, related by certain points of resemblance in structure or development, more comprehensive than a genus, because it is usually based on fewer or less pronounced points of likeness. In zoölogy a family is less comprehesive than an order; in botany it is often considered the same thing as a…

egetable organisms, and the fermentations which they engender are due to their growth and development; as, the acetic ferment, the butyric ferment, etc. See Fermentation. Ferments of the second class, on the other hand, are chemical substances, as a rule soluble in glycerin and precipitated by alcohol. In action they a…

bryo of an animal in the womb, or in the egg; often restricted to the later stages in the development of viviparous and oviparous animals, embryo being applied to the earlier stages. [Written also foetus.]

nctly or become indistinct, as the picture on a negative sometimes does in the process of development.

Capable of growth and development; germinal; as, living or formative matter.

Having structure; capable of growth and development; organized; as, the formed or organized ferments. See Ferment, n. Formed material (Biol.), a term employed by Beale to denote the lifeless matter of a cell, that which is physiologically dead, in distinction from the truly germinal or living matter.…

Out, as from a state of concealment, retirement, confinement, nondevelopment, or the like; out into notice or view; as, the plants in spring put forth leaves. When winter past, and summer scarce begun, Invites them forth to labor in the sun. Dryden.

That stage of growth or development in an organism, in which the reproductive elements are generated and matured in preparation for propagating the species.

st). See Illust. under Invagination. In a more general sense, an ideal stage in embryonic development. See Gastræa. -- a.

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

ned with, or determined by, the genesis of anything, or its natural mode of production or development. This historical, genetical method of viewing prior systems of philosophy. Hare.

participate; namely, the act of generation by which the germ is produced; and the act of development, by which that germ is evolved into the complete organism. Carpenter.