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Semiopacous :: Semiopacous (a.) Semiopaque.

Pyrophane :: Pyrophane (n.) A mineral which is opaque in its natural state, but is said to change its color and become transparent by heat..

Dense :: Dense (a.) Having the constituent parts massed or crowded together; close; compact; thick; containing much matter in a small space; heavy; opaque; as, a dense crowd; a dense forest; a dense fog..

Whitish :: Whitish (a.) Covered with an opaque white powder.

Laumontite :: Laumontite (n.) A mineral, of a white color and vitreous luster. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles..

Negative :: Negative (n.) A picture upon glass or other material, in which the light portions of the original are represented in some opaque material (usually reduced silver), and the dark portions by the uncovered and transparent or semitransparent ground of the picture..

Cawk :: Cawk (n.) An opaque, compact variety of barite, or heavy spar..

Mercury :: Mercury (n.) A metallic element mostly obtained by reduction from cinnabar, one of its ores. It is a heavy, opaque, glistening liquid (commonly called quicksilver), and is used in barometers, thermometers, ect. Specific gravity 13.6. Symbol Hg (Hydrargyrum). Atomic weight 199.8. Mercury has a molecule which consists of only one atom. It was named by the alchemists after the god Mercury, and designated by his symbol, /..

Megascope :: Megascope (n.) A modification of the magic lantern, used esp. for throwing a magnified image of an opaque object on a screen, solar or artificial light being used..

Ivory :: Ivory (n.) The hard, white, opaque, fine-grained substance constituting the tusks of the elephant. It is a variety of dentine, characterized by the minuteness and close arrangement of the tubes, as also by their double flexure. It is used in manufacturing articles of ornament or utility..

Diorama :: Diorama (n.) A mode of scenic representation, invented by Daguerre and Bouton, in which a painting is seen from a distance through a large opening. By a combination of transparent and opaque painting, and of transmitted and reflected light, and by contrivances such as screens and shutters, much diversity of scenic effect is produced..

Distemper :: Distemper (v. t.) A preparation of opaque or body colors, in which the pigments are tempered or diluted with weak glue or size (cf. Tempera) instead of oil, usually for scene painting, or for walls and ceilings of rooms..

Keratonyxis :: Keratonyxis (n.) The operation of removing a cataract by thrusting a needle through the cornea of the eye, and breaking up the opaque mass..

Topaz :: Topaz (n.) A mineral occurring in rhombic prisms, generally yellowish and pellucid, also colorless, and of greenesh, bluish, or brownish shades. It sometimes occurs massive and opaque. It is a fluosilicate of alumina, and is used as a gem..

Obsidian :: Obsidian (n.) A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters..

Opaque :: Opaque (a.) Obscure; not clear; unintelligible.

Optics :: Optics (n.) That branch of physical science which treats of the nature and properties of light, the laws of its modification by opaque and transparent bodies, and the phenomena of vision..

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..

Couching :: Couching (n.) The operation of putting down or displacing the opaque lens in cataract.

Pus :: Pus (a.) The yellowish white opaque creamy matter produced by the process of suppuration. It consists of innumerable white nucleated cells floating in a clear liquid.

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