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Pyrolusite :: Pyrolusite (n.) Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name)..

Ruthenium :: Ruthenium (n.) A rare element of the light platinum group, found associated with platinum ores, and isolated as a hard, brittle steel-gray metal which is very infusible. Symbol Ru. Atomic weight 103.5. Specific gravity 12.26. See Platinum metals, under Platinum..

Mugil :: Mugil (n.) A genus of fishes including the gray mullets. See Mullet.

Chalk :: Chalk (n.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common limestone..

Hoar :: Hoar (a.) Gray or white with age; hoary.

Half-moon :: Half-moon (n.) A marine, sparoid, food fish of California (Caesiosoma Californiense). The body is ovate, blackish above, blue or gray below. Called also medialuna..

Siren :: Siren (n.) Any long, slender amphibian of the genus Siren or family Sirenidae, destitute of hind legs and pelvis, and having permanent external gills as well as lungs. They inhabit the swamps, lagoons, and ditches of the Southern United States. The more common species (Siren lacertina) is dull lead-gray in color, and becames two feet long..

Fasciola :: Fasciola (n.) A band of gray matter bordering the fimbria in the brain; the dentate convolution.

Unau :: Unau (n.) The two-toed sloth (Cholopus didactylus), native of South America. It is about two feet long. Its color is a uniform grayish brown, sometimes with a reddish tint..

Tantalum :: Tantalum (n.) A rare nonmetallic element found in certain minerals, as tantalite, samarskite, and fergusonite, and isolated as a dark powder which becomes steel-gray by burnishing. Symbol Ta. Atomic weight 182.0. Formerly called also tantalium..

Grauwacke :: Grauwacke (n.) Graywacke.

Brocatel :: Brocatel (n.) A marble, clouded and veined with white, gray, yellow, and red, in which the yellow usually prevails. It is also called Siena marble, from its locality..

Pumice :: Pumice (n.) A very light porous volcanic scoria, usually of a gray color, the pores of which are capillary and parallel, giving it a fibrous structure. It is supposed to be produced by the disengagement of watery vapor without liquid or plastic lava. It is much used, esp. in the form of powder, for smoothing and polishing. Called also pumice stone..

Sage :: Sage (n.) A suffruticose labiate plant (Salvia officinalis) with grayish green foliage, much used in flavoring meats, etc. The name is often extended to the whole genus, of which many species are cultivated for ornament, as the scarlet sage, and Mexican red and blue sage..

Grayfly :: Grayfly (n.) The trumpet fly.

Enstatite :: Enstatite (n.) A mineral of the pyroxene group, orthorhombic in crystallization; often fibrous and massive; color grayish white or greenish. It is a silicate of magnesia with some iron. Bronzite is a ferriferous variety..

Fulvous :: Fulvous (a.) Tawny; dull yellow, with a mixture of gray and brown..

Rosemary :: Rosemary (n.) A labiate shrub (Rosmarinus officinalis) with narrow grayish leaves, growing native in the southern part of France, Spain, and Italy, also in Asia Minor and in China. It has a fragrant smell, and a warm, pungent, bitterish taste. It is used in cookery, perfumery, etc., and is an emblem of fidelity or constancy..

Grayback :: Grayback (n.) The redbreasted sandpiper or knot.

Zinkenite :: Zinkenite (n.) A steel-gray metallic mineral, a sulphide of antimony and lead..

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