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Hygrophanous :: Hygrophanous (a.) Having such a structure as to be diaphanous when moist, and opaque when dry..

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..

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

Pterostigma :: Pterostigma (n.) A thickened opaque spot on the wings of certain insects.

Perspicuous :: Perspicuous (a.) Capable of being through; transparent; translucent; not opaque.

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..

Opake :: Opake (a.) See Opaque.

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..

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..

Corpulent :: Corpulent (a.) Solid; gross; opaque.

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..

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..

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

Pellucid :: Pellucid (a.) Transparent; clear; limpid; translucent; not opaque.

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..

Cacholong :: Cacholong (n.) An opaque or milk-white chalcedony, a variety of quartz; also, a similar variety of opal..

Tubercle :: Tubercle (n.) A small mass or aggregation of morbid matter; especially, the deposit which accompanies scrofula or phthisis. This is composed of a hard, grayish, or yellowish, translucent or opaque matter, which gradually softens, and excites suppuration in its vicinity. It is most frequently found in the lungs, causing consumption..

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, /..

Lepidomelane :: Lepidomelane (n.) An iron-potash mica, of a raven-black color, usually found in granitic rocks in small six-sided tables, or as an aggregation of minute opaque scales. See Mica..

Semiopacous :: Semiopacous (a.) Semiopaque.

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