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Hydroquinone :: Hydroquinone (n.) A white crystalline substance, C6H4(OH)2, obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric with, pyrocatechin and resorcin. Called also dihydroxy benzene..

Omander Wood :: Omander wood () The wood of Diospyros ebenaster, a kind of ebony found in Ceylon..

Pyrometer :: Pyrometer (n.) An instrument for measuring degrees of heat above those indicated by the mercurial thermometer.

Pyrgom :: Pyrgom (n.) A variety of pyroxene; -- called also fassaite.

Pyro- :: Pyro- () Alt. of Pyr.

Protocatechuic :: Protocatechuic (a.) Pertaining to, derived from, or designating, an organic acid which is obtained as a white crystalline substance from catechin, asafetida, oil of cloves, etc., and by distillation itself yields pyrocatechin..

Manganese :: Manganese (n.) An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty, but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic weight 54.8..

Pyruvic :: Pyruvic (a.) Pertaining to, or designating, an acid (called also pyroracemic acid) obtained, as a liquid having a pungent odor, by the distillation of racemic acid..

Pyroacetic :: Pyroacetic (a.) Pertaining to, and designating, a substance (acetone) obtained by the distillation of the acetates. It is now called also pyroacetic ether, and formerly was called pyroacetic spirit..

Mabolo :: Mabolo (n.) A kind of persimmon tree (Diospyros discolor) from the Philippine Islands, now introduced into the East and West Indies. It bears an edible fruit as large as a quince..

Pyrotartaric :: Pyrotartaric (a.) Pertaining to, or designating, an acid obtained as a white crystalline substance by the distillation of tartaric acid..

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)..

Veratrol :: Veratrol (n.) A liquid hydrocarbon obtained by the decomposition of veratric acid, and constituting the dimethyl ether of pyrocatechin..

Uralitization :: Uralitization (n.) The change of pyroxene to amphibole by paramorphism.

Pyr- :: Pyr- () Combining forms designating fire or heat; specifically (Chem.), used to imply an actual or theoretical derivative by the action of heat; as in pyrophosphoric, pyrosulphuric, pyrotartaric, pyrotungstic, etc..

Pyrophone :: Pyrophone (n.) A musical instrument in which the tones are produced by flames of hydrogen, or illuminating gas, burning in tubes of different sizes and lengths..

Salite :: Salite (n.) A massive lamellar variety of pyroxene, of a dingy green color..

Collodion :: Collodion (n.) A solution of pyroxylin (soluble gun cotton) in ether containing a varying proportion of alcohol. It is strongly adhesive, and is used by surgeons as a coating for wounds; but its chief application is as a vehicle for the sensitive film in photography..

Rensselaerite :: Rensselaerite (n.) A soft, compact variety of talc,, being an altered pyroxene. It is often worked in a lathe into inkstands and other articles..

Pyrography :: Pyrography (n.) A process of printing, ornamenting, or carving, by burning with heated instruments..

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