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Pyroxanthin :: Pyroxanthin (n.) A yellow crystalline hydrocardon extracted from crude wood spirit; -- called also eblanin.

Hesperetin :: Hesperetin (n.) A white, crystalline substance having a sweetish taste, obtained by the decomposition of hesperidin, and regarded as a complex derivative of caffeic acid..

Phthalin :: Phthalin (n.) A colorless crystalline substance obtained by reduction from phthalein, into which it is easily converted by oxidation; hence, any one of the series of which phthalin proper is the type..

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..

Aphakia :: Aphakia (n.) An anomalous state of refraction caused by the absence of the crystalline lens, as after operations for cataract. The remedy is the use of powerful convex lenses..

Potash :: Potash (n.) The impure potassium carbonate obtained by leaching wood ashes, either as a strong solution (lye), or as a white crystalline (pearlash)..

Ricinelaidic :: Ricinelaidic (a.) Pertaining to, or designating, an isomeric modification of ricinoleic acid obtained as a white crystalline solid..

Sulphinic :: Sulphine (n.) Any one of a series of basic compounds which consist essentially of sulphur united with hydrocarbon radicals. In general they are oily or crystalline deliquescent substances having a peculiar odor; as, trimethyl sulphine, (CH3)3S.OH. Cf. Sulphonium..

Undecolic :: Undecolic (a.) Pertaining to, or designating, an acid, C11H18O2, of the propiolic acid series, obtained indirectly from undecylenic acid as a white crystalline substance..

Cataract :: Cataract (n.) An opacity of the crystalline lens, or of its capsule, which prevents the passage of the rays of light and impairs or destroys the sight..

Borax :: Borax (n.) A white or gray crystalline salt, with a slight alkaline taste, used as a flux, in soldering metals, making enamels, fixing colors on porcelain, and as a soap. It occurs native in certain mineral springs, and is made from the boric acid of hot springs in Tuscany. It was originally obtained from a lake in Thibet, and was sent to Europe under the name of tincal. Borax is a pyroborate or tetraborate of sodium, Na2B4O7.10H2O..

Myristic :: Myristic (a.) Pertaining to, or derived from, the nutmeg (Myristica). Specifically, designating an acid found in nutmeg oil and otoba fat, and extracted as a white crystalline waxy substance..

Glycosine :: Glycosine (n.) An organic base, C6H6N4, produced artificially as a white, crystalline powder, by the action of ammonia on glyoxal..

Quinine :: Quinine (n.) An alkaloid extracted from the bark of several species of cinchona (esp. Cinchona Calisaya) as a bitter white crystalline substance, C20H24N2O2. Hence, by extension (Med.), any of the salts of this alkaloid, as the acetate, chloride, sulphate, etc., employed as a febrifuge or antiperiodic. Called also quinia, quinina, etc..

Daphnetin :: Daphnetin (n.) A colorless crystalline substance, C9H6O4, extracted from daphnin..

Glyoxime :: Glyoxime (n.) A white, crystalline, nitrogenous substance, produced by the action of hydroxylamine on glyoxal, and belonging to the class of oximes; also, any one of a group of substances resembling glyoxime proper, and of which it is a type. See Oxime..

Selenium :: Selenium (n.) A nonmetallic element of the sulphur group, and analogous to sulphur in its compounds. It is found in small quantities with sulphur and some sulphur ores, and obtained in the free state as a dark reddish powder or crystalline mass, or as a dark metallic-looking substance. It exhibits under the action of light a remarkable variation in electric conductivity, and is used in certain electric apparatus. Symbol Se. Atomic weight 78.9..

Melanuric :: Melanuric (a.) Pertaining to, or designating, a complex nitrogenous acid obtained by decomposition of melam, or of urea, as a white crystalline powder; -- called also melanurenic acid..

Subcultrate :: Subcrystalline (a.) Imperfectly crystallized.

Pyrene :: Pyrene (n.) One of the less volatile hydrocarbons of coal tar, obtained as a white crystalline substance, C16H10..

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