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A division of acalephs in which the development is direct from the eggs, without a hydroid stage. Some of the species are parasitic on other medusæ.

Any change in an organism which alters its general character and mode of life, as in the development of the germ into the embryo, the egg into the animal, the larva into the insect (metamorphosis), etc.; also, the change which the histological units of a tissue are prone to undergo. See Metamorphosis.…

The change of one species into another, which is assumed to take place in any development theory of life; transformism. Bacon. Transmutation of metals (Alchem.), the conversion of base metals into gold or silver, a process often attempted by the alchemists. See Alchemy, and Philosopher's stone, under Philosopher.…

A genus of fresh-water or river turtles which have the shell imperfectly developed and covered with a soft leathery skin. They are noted for their agility and rapacity. Called also soft tortoise, soft-shell tortoise, and mud turtle.

A theory of the development of mammalian molar teeth. The primitive stage is that of simple cones, as in reptiles. The simple cone then developed a smaller cone in front and another behind. Next, a cingulum was developed, and the three cones became arranged in a triangle, the two smaller cusps having moved to the outer…

oung larval form of many annelids, mollusks, and bryozoans, in which a circle of cilia is developed around the anterior end.

Characterized by the development of tubercles; as, tubercular diathesis.

The development of tubercles; the condition of one who is affected with tubercles.

first reigning Tudor was Henry VII.; the last, Elizabeth. Tudor style (Arch.), the latest development of Gothic architecture in England, under the Tudors, characterized by flat four-centered arches, shallow moldings, and a profusion of paneling on the walls.

Not fledged; not feathered; hence, not fully developed; immature. Dryden.

; to lay open to view or contemplation; to bring out in all the details, or by successive development; to display; to disclose; to reveal; to elucidate; to explain; as, to unfold one's designs; to unfold the principles of a science. Unfold the passion of my love. Shak.

Having only one axis; developing along a single line or plane; -- opposed to multiaxial.

Having a single center of growth. Unicentral development, that form of development which takes place primarily around a single central point, as in the lowest of unicellular organisms.

se; in oratory, discourse, etc., the due subordination and reference of every part to the development of the leading idea or the eastablishment of the main proposition.

ferent tissues and organs characteristic of living organisms, nor the power of growth and development; as, the unorganized ferments. See the Note under Ferment, n., 1.

Developing too early; premature. Sir P. Sidney.

The process or result of growing up; progress; development. The new and mighty upgrowth of poetry in Italy. J. R. Green.

An order of amphibians having the tail well developed and often long. It comprises the salamanders, tritons, and allied animals.

The organ of a female mammal in which the young are developed previous to birth; the womb.

Concerned in the development and formation of blood vessels and blood corpuscles; as, the vasoformative cells.