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Barbituric Acid :: Barbituric acid () A white, crystalline substance, CH2(CO.NH)2.CO, derived from alloxantin, also from malonic acid and urea, and regarded as a substituted urea..

Cotarnine :: Cotarnine (n.) A white, crystalline substance, C12H13NO3, obtained as a product of the decomposition of narcotine. It has weak basic properties, and is usually regarded as an alkaloid..

Xylorcin :: Xylorcin (n.) A derivative of xylene obtained as a white crystalline substance which on exposure in the air becomes red; -- called also betaorcin.

Pectolite :: Pectolite (n.) A whitish mineral occurring in radiated or fibrous crystalline masses. It is a hydrous silicate of lime and soda.

Mineral :: Mineral (v. i.) An inorganic species or substance occurring in nature, having a definite chemical composition and usually a distinct crystalline form. Rocks, except certain glassy igneous forms, are either simple minerals or aggregates of minerals..

Crystal :: Crystal (a.) Consisting of, or like, crystal; clear; transparent; lucid; pellucid; crystalline..

Phloroglucin :: Phloroglucin (n.) A sweet white crystalline substance, metameric with pyrogallol, and obtained by the decomposition of phloretin, and from certain gums, as catechu, kino, etc. It belongs to the class of phenols. [Called also phloroglucinol.].

Lophine :: Lophine (n.) A nitrogenous organic base obtained by the oxidation of amarine, and regarded as a derivative of benzoic aldehyde. It is obtained in long white crystalline tufts, -- whence its name..

Muscarin :: Muscarin (n.) A solid crystalline substance, C5H13NO2, found in the toadstool (Agaricus muscarius), and in putrid fish. It is a typical ptomaine, and a violent poison..

Trona :: Trona (n.) A native double salt, consisting of a combination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum..

Populin :: Populin (n.) A glycoside, related to salicin, found in the bark of certain species of the poplar (Populus), and extracted as a sweet white crystalline substance..

Flavol :: Flavol (n.) A yellow, crystalline substance, obtained from anthraquinone, and regarded as a hydroxyl derivative of it..

Gentiopikrin :: Gentiopikrin (n.) A bitter, yellow, crystalline substance, regarded as a glucoside, and obtained from the gentian..

Saccharin :: Saccharin (n.) A bitter white crystalline substance obtained from the saccharinates and regarded as the lactone of saccharinic acid; -- so called because formerly supposed to be isomeric with cane sugar (saccharose).

Ligustrin :: Ligustrin (n.) A bitter principle found in the bark of the privet (Ligustrum vulgare), and extracted as a white crystalline substance with a warm, bitter taste; -- called also ligustron..

Aurichalcite :: Aurichalcite (n.) A hydrous carbonate of copper and zinc, found in pale green or blue crystalline aggregations. It yields a kind of brass on reduction..

Thionoline :: Thionoline (n.) A beautiful fluorescent crystalline substance, intermediate in composition between thionol and thionine..

Tolane :: Tolane (n.) A hydrocarbon, C14H10, related both to the acetylene and the aromatic series, and produced artificially as a white crystalline substance; -- called also diphenyl acetylene..

Param :: Param (n.) A white crystalline nitrogenous substance (C2H4N4); -- called also dicyandiamide.

Presbyopia :: Presbyopia () A defect of vision consequent upon advancing age. It is due to rigidity of the crystalline lens, which produces difficulty of accommodation and recession of the near point of vision, so that objects very near the eyes can not be seen distinctly without the use of convex glasses. Called also presbytia..

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