Search the Dictionary

A scientific study of children, undertaken for the purpose of discovering the laws of development of the body and the mind from birth to manhood.

ipeds. They have a single pair of elongated legs attached laterally to each segment; well developed jaws; and a pair of thoracic legs converted into poison fangs. They are insectivorous, very active, and some species grow to the length of a foot.

A plastid containing chlorophyll, developed only in cells exposed to the light. Chloroplasts are minute flattened granules, usually occurring in great numbers in the cytoplasm near the cell wall, and consist of a colorless ground substance saturated with chlorophyll pigments. Under light of varying intensity they exhib…

The development of cartilage.

the fetus in the womb; also, the similar membrane investing many ova at certain stages of development.

changes of color in the translucent skin of such animals as possess them. They are highly developed and numerous in the cephalopods.

An embryonic cell which develops into a pigment cell.

photographic picture taken upon paper prepared by the use of a sensitive salt of iron and developed by the application of chloride of gold. Abney.

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

An epoch at the close of the American lower Silurian system. The rocks are well developed near Cincinnati, Ohio. The group includes the Hudson River and Lorraine shales of New york.

A division of passerine birds in which the vocal muscles are but little developed, so that they lack the power of singing.

One of a pair of male copulatory organs, developed on the anterior side of the ventral fins of sharks and other elasmobranchs. See Illust. of Chimæra.

One of the small bulbs developed in the axils of the scales of a large bulb, as in the case of garlic. Developing, in the axils of its skales, new bulbs, of what gardeners call cloves. Lindley.

One of the cells which, in the Coelenterata, develop into cnidæ.

A subdivision of the cretaceous formation of western North America, especially developed in Colorado and the upper Missouri region.

A cranial development supposed to indicate a combative disposition.

of either the masculine or the feminine gender. -- Common law, a system of jurisprudence developing under the guidance of the courts so as to apply a consistent and reasonable rule to each litigated case. It may be superseded by statute, but unless superseded it controls. Wharton.

A natural tendency inherent in a body to develop itself; an attempt; an effort. What conatus could give prickles to the porcupine or hedgehog, or to the sheep its fleece Paley.

Plot; action; construction; manner of development. The book of Job, in conduct and diction. Macaulay. Conduct money (Naut.), a portion of a seaman's wages retained till the end of his engagement, and paid over only if his conduct has been satisfactory.

e cells or individuals in some plants and lower animals, by which new spores or germs are developed.