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To disappoint. [Obs.] When his expectation is destituted. Fotherby.

ion. -- Detonating powder, any powder or solid substance, as fulminate of mercury, which when struck, explodes with violence and a loud report. -- Detonating primer, a primer exploded by a fuse; -- used to explode gun cotton in blasting operations. -- Detonating tube, a strong tube of glass, usually graduated, close…

A condition of the score beginning whendeuce, which decides the game.

The falling of dew; the time when dew begins to fall.

The flesh upon the human throat, especially when with age. [Burlesque] On her withered dewlap pour the ale. Shak.

, consisting of, or moist with, dew. A dewy mist Went and watered all the ground. Milton. When dewy eve her curtain draws. Keble.

.), a spiral shell the whorls of which turn from left right, or like the hands of a watch when the apex of the spire is toward the eye of the observer.

A plaster originally composed of the juices of several plants (whence its name), but now made of an oxide of lead and oil, and consisting essentially of glycerin mixed with lead salts of the fat acids.

To adorn with a diadem; to crown. Not so, when diadem'd with rays divine. Pope. To terminate the evil, To diadem the right. R. H. Neale.

lamellar masses with brilliant pearly luster; -- so named on account of its decrepitating when heated before the blowpipe.

A double star; -- applied to the nucleus of a cell, when, during cell division, the loops of the nuclear network separate into two groups, preparatory to the formation of two daughter nuclei. See Karyokinesis.

The property of presenting different colors by transmitted light, when viewed in two different directions, the colors being unlike in the direction of unlike or unequal axes.

Iolite; -- so called from its presenting two different colors when viewed in two different directions. See Iolite.

tio of the increment of a function of a variable to the increment of the variable itself, when these increments are made indefinitely small. -- Differential coupling, a form of slip coupling used in light machinery to regulate at pleasure the velocity of the connected shaft. -- Differential duties (Polit. Econ.), dut…

l formation or production of organs or parts by a process of evolution or development, as when the seed develops the root and the stem, the initial stem develops the leaf, branches, and flower buds; or in animal life, when the germ evolves the digestive and other organs and members, or when the animals as they advance…

A substance which, when applied to a wound or ulcer, promotes suppuration. Dunglison.

Difference of form between members of the same species, as when a plant has two kinds of flowers, both hermaphrodite (as in the partridge berry), or when there are two forms of one or both sexes of the same species of butterfly. Dimorphism is the condition of the appearance of the same species under two dissimilar form…

An order of extinct mesozoic reptiles, mostly of large size (whence the name). Notwithstanding their size, they present birdlike characters in the skeleton, esp. in the pelvis and hind limbs. Some walked on their three-toed hind feet, thus producing the large "bird tracks," so-called, of mesozoic sandstones; others wer…

To pierce; to penetrate; -- followed by in or into. When I dipt into the future. Tennyson.

Characterizing the ovum when it has two primary germinal layers.