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Conversion of the cell walls into cork tissue by development of suberin; -- commonly taking place in exposed tissues, as when a callus forms over a wound. Suberized cell walls are impervious to water.

A stage in the development of certain insects, such as the May flies, intermediate between the pupa and imago. In this stage, the insect is able to fly, but subsequently sheds a skin before becoming mature. Called also pseudimago.

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 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…

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.

; 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 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.

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

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

ctenophore (Cestum Veneris) which swims in the open sea. Its form is due to the enormous development of two spheromeres. See Illust. in Appendix. -- Venus's hair (Bot.), a delicate and graceful fern (Adiantum Capillus-Veneris) having a slender, black and shining stem and branches. -- Venus's hair stone (Min.), quart…

Capable of living; born alive and with such form and development of organs as to be capable of living; -- said of a newborn, or a prematurely born, infant.

A rare skin disease consisting in the development of smooth, milk-white spots upon various parts of the body.

A skin disease marked by the development or irregular yellowish patches upon the skin, especially upon the eyelids; -- called also xanthelasma.

An animal in one of its inferior stages of development, as one of the intermediate forms in alternate generation.