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Malacostraca :: Malacostraca (n. pl.) A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca..

Cirripedia :: Cirripedia (n. pl.) An order of Crustacea including the barnacles. When adult, they have a calcareous shell composed of several pieces. From the opening of the shell the animal throws out a group of curved legs, looking like a delicate curl, whence the name of the group. See Anatifa..

Prawn :: Prawn (n.) Any one of numerous species of large shrimplike Crustacea having slender legs and long antennae. They mostly belong to the genera Pandalus, Palaemon, Palaemonetes, and Peneus, and are much used as food. The common English prawn is Palaemon serratus..

Oviferous :: Oviferous (a.) Egg-bearing; -- applied particularly to certain receptacles, as in Crustacea, that retain the eggs after they have been excluded from the formative organs, until they are hatched..

Effloresce :: Effloresce (v. i.) To become covered with a whitish crust or light crystallization, from a slow chemical change between some of the ingredients of the matter covered and an acid proceeding commonly from an external source; as, the walls of limestone caverns sometimes effloresce with nitrate of calcium in consequence of the action in consequence of nitric acid formed in the atmosphere..

Paragnathus :: Paragnathus (n.) One of the two lobes which form the lower lip, or metastome, of Crustacea..

Aptera :: Aptera (n. pl.) Insects without wings, constituting the seventh Linnaen order of insects, an artificial group, which included Crustacea, spiders, centipeds, and even worms. These animals are now placed in several distinct classes and orders..

Foul :: Foul (v. t.) To incrust (the bore of a gun) with burnt powder in the process of firing.

Pleopod :: Pleopod (n.) One of the abdominal legs of a crustacean. See Illust. under Crustacea.

Node :: Node (n.) A hard concretion or incrustation which forms upon bones attacked with rheumatism, gout, or syphilis; sometimes also, a swelling in the neighborhood of a joint..

Geosynclinal :: Geosynclinal (n.) the downward bend or subsidence of the earth's crust, which allows of the gradual accumulation of sediment, and hence forms the first step in the making of a mountain range; -- opposed to geanticlinal..

Silicon :: Silicon (n.) A nonmetalic element analogous to carbon. It always occurs combined in nature, and is artificially obtained in the free state, usually as a dark brown amorphous powder, or as a dark crystalline substance with a meetallic luster. Its oxide is silica, or common quartz, and in this form, or as silicates, it is, next to oxygen, the most abundant element of the earth's crust. Silicon is characteristically the element of the mineral kingdom, as carbon is of the organic world. Symbol Si. A

Crust :: Crust (n.) To cover with a crust; to cover or line with an incrustation; to incrust.

Facet :: Facet (n.) One of the numerous small eyes which make up the compound eyes of insects and crustaceans.

Holostraca :: Holostraca (n. pl.) A division of phyllopod Crustacea, including those that are entirely covered by a bivalve shell..

Crustily :: Crustily (adv.) In a crusty or surly manner; morosely.

Tartar :: Tartar (n.) A correction which often incrusts the teeth, consisting of salivary mucus, animal matter, and phosphate of lime..

Crusted :: Crusted (imp. & p. p.) of Crus.

Efflorescence :: Efflorescence (n.) The formation of the whitish powder or crust on the surface of efflorescing bodies, as salts, etc..

Plutonism :: Plutonism (n.) The theory, early advanced in geology, that the successive rocks of the earth's crust were formed by igneous fusion; -- opposed to the Neptunian theory..

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