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pyrogallol

[ pahy-ruh-gal-awl, -ol, -guh-lawl, -lol ]

noun

  1. a white, crystalline, water-soluble, poisonous, solid, phenolic compound, C 6 H 3 (OH) 3 , obtained by heating gallic acid and water: used chiefly as a developer in photography, as a mordant for wool, in dyeing, and in medicine in the treatment of certain skin conditions.


pyrogallol

/ ˌpaɪrəʊˈɡælɒl /

noun

  1. a white lustrous crystalline soluble phenol with weakly acidic properties; 1,2,3-trihydroxybenzene: used as a photographic developer and for absorbing oxygen. Formula: C 6 H 3 (OH) 3
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Derived Forms

  • ˌpyroˈgallic, adjective
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Other Words From

  • py·ro·gal·lic [pahy-r, uh, -, gal, -ik, -, gaw, -lik], adjective
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Word History and Origins

Origin of pyrogallol1

First recorded in 1875–80; pyro- + gall(ic) 2 + -ol 1
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Word History and Origins

Origin of pyrogallol1

C20: from pyro- + gall ( ic )² + -ol 1
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Example Sentences

Sumach is the other pyrogallol tan of commercial importance.

Pyrogallol is valuable, and is employed in the same manner and strength as chrysarobin.

Newton employs it in combination with pyrogallol and soda in the development of bromo-gelatine plates.

The phthaleïn formed from gallic acid and phthalic anhydride really results from the union of the latter with pyrogallol.

The tannins are divided into two general classes, known respectively as the pyrogallol tannins and the catechol tannins.

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pyrogallatepyrogen