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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..

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..

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

Quartz :: Quartz (n.) A form of silica, or silicon dioxide (SiO2), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes 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..

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

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..

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..

Halones :: Halones (n. pl.) Alternating transparent and opaque white rings which are seen outside the blastoderm, on the surface of the developing egg of the hen and other birds..

Opaqueness :: Opaqueness (n.) The state or quality of being impervious to light; opacity.

Jasper :: "Jasper (n.) An opaque, impure variety of quartz, of red, yellow, and other dull colors, breaking with a smooth surface. It admits of a high polish, and is used for vases, seals, snuff boxes, etc. When the colors are in stripes or bands, it is called striped / banded jasper. The Egyptian pebble is a brownish yellow jasper..

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

Opacular :: Opacular (a.) Opaque.

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.

Radiograph :: Radiograph (n.) A picture produced by the Rontgen rays upon a sensitive surface, photographic or fluorescent, especially a picture of opaque objects traversed by the rays..

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..

Opaque :: Opaque (n.) That which is opaque; opacity.

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