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Phantasmagoria :: Phantasmagoria (n.) An optical effect produced by a magic lantern. The figures are painted in transparent colors, and all the rest of the glass is opaque black. The screen is between the spectators and the instrument, and the figures are often made to appear as in motion, or to merge into one another..

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..

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..

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..

Semiopacous :: Semiopacous (a.) Semiopaque.

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

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..

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, /..

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

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..

Leucoxene :: Leucoxene (n.) A nearly opaque white mineral, in part identical with titanite, observed in some igneous rocks as the result of the alteration of titanic iron..

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

Clear :: Clear (superl.) Free from opaqueness; transparent; bright; light; luminous; unclouded.

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

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..

Opacular :: Opacular (a.) Opaque.

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..

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.

Allanite :: Allanite (n.) A silicate containing a large amount of cerium. It is usually black in color, opaque, and is related to epidote in form and composition..

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

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