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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..

Opacity :: Opacity (n.) The state of being opaque; the quality of a body which renders it impervious to the rays of light; want of transparency; opaqueness.

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..

Opaque :: Opaque (a.) Impervious to the rays of light; not transparent; as, an opaque substance..

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..

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, /..

Deflection :: Deflection (n.) A deviation of the rays of light toward the surface of an opaque body; inflection; diffraction.

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

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..

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

Lieberkuhn :: Lieberkuhn (n.) A concave metallic mirror attached to the object-glass end of a microscope, to throw down light on opaque objects; a reflector..

Opacular :: Opacular (a.) Opaque.

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

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..

Transparent :: Transparent (a.) Having the property of transmitting rays of light, so that bodies can be distinctly seen through; pervious to light; diaphanous; pellucid; as, transparent glass; a transparent diamond; -- opposed to opaque..

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.

Couch :: Couch (v. t.) To treat by pushing down or displacing the opaque lens with a needle; as, to couch a cataract..

Majolica :: Majolica (n.) A kind of pottery, with opaque glazing and showy, which reached its greatest perfection in Italy in the 16th century..

Opake :: Opake (a.) See Opaque.

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