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Flint Glass :: Flint glass () A soft, heavy, brilliant glass, consisting essentially of a silicate of lead and potassium. It is used for tableware, and for optical instruments, as prisms, its density giving a high degree of dispersive power; -- so called, because formerly the silica was obtained from pulverized flints. Called also crystal glass. Cf. Glass..

Diprismatic :: Diprismatic (a.) Doubly prismatic.

Goethite :: Goethite (n.) A hydrous oxide of iron, occurring in prismatic crystals, also massive, with a fibrous, reniform, or stalactitic structure. The color varies from yellowish to blackish brown..

Prismatically :: Prismatically (adv.) In the form or manner of a prism; by means of a prism.

Indigo :: Indigo (n.) A kind of deep blue, one of the seven prismatic colors..

Dome :: Dome (n.) A prism formed by planes parallel to a lateral axis which meet above in a horizontal edge, like the roof of a house; also, one of the planes of such a form..

Iceland Spar :: Iceland spar () A transparent variety of calcite, the best of which is obtained in Iceland. It is used for the prisms of the polariscope, because of its strong double refraction. Cf. Calcite..

Teinoscope :: Teinoscope (n.) An instrument formed by combining prisms so as to correct the chromatic aberration of the light while linear dimensions of objects seen through the prisms are increased or diminished; -- called also prism telescope.

Macropyramid :: Macropyramid (n.) See Macroprism.

Prism :: Prism (n.) A solid whose bases or ends are any similar, equal, and parallel plane figures, and whose sides are parallelograms..

Diffraction :: Diffraction (n.) The deflection and decomposition of light in passing by the edges of opaque bodies or through narrow slits, causing the appearance of parallel bands or fringes of prismatic colors, as by the action of a grating of fine lines or bars..

Crayon :: Crayon (n.) An implement for drawing, made of clay and plumbago, or of some preparation of chalk, usually sold in small prisms or cylinders..

Sulphur :: Sulphur (n.) A nonmetallic element occurring naturally in large quantities, either combined as in the sulphides (as pyrites) and sulphates (as gypsum), or native in volcanic regions, in vast beds mixed with gypsum and various earthy materials, from which it is melted out. Symbol S. Atomic weight 32. The specific gravity of ordinary octohedral sulphur is 2.05; of prismatic sulphur, 1.96..

Brachydiagonal :: Brachydiagonal (a.) Pertaining to the shorter diagonal, as of a rhombic prism..

Prismoidal :: Prismoidal (a.) Having the form of a prismoid; as, prismoidal solids..

Pseudo-symmetry :: Pseudo-symmetry (n.) A kind of symmetry characteristic of certain crystals which from twinning, or other causes, come to resemble forms of a system other than that to which they belong, as the apparently hexagonal prisms of aragonite..

Cylinder :: Cylinder (n.) The revolving square prism carrying the cards in a Jacquard loom.

Prismatical :: Prismatical (a.) Resembling, or pertaining to, a prism; as, a prismatic form or cleavage..

Metallochrome :: Metallochrome (n.) A coloring produced by the deposition of some metallic compound; specifically, the prismatic tints produced by depositing a film of peroxide of lead on polished steel by electricity..

Duct :: Duct (n.) A large, elongated cell, either round or prismatic, usually found associated with woody fiber..

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