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[pahy-ruh-gal-awl, -ol, -guh-lawl, -lol] /ˌpaɪ rəˈgæl ɔl, -ɒl, -gəˈlɔl, -ˈlɒl/
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.
Also called pyrogallic acid.
Origin of pyrogallol
First recorded in 1875-80; pyro- + gall(ic)2 + -ol1
Related forms
[pahy-ruh-gal-ik, -gaw-lik] /ˌpaɪ rəˈgæl ɪk, -ˈgɔ lɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for pyrogallol
Historical Examples
  • It is the only pyrogallol tannin which does not deposit bloom, or ellagic acid, on the leather.

    Leather K. J. Adcock
  • Tanning materials are divided into two main classes: pyrogallol, Catechol.

    Leather K. J. Adcock
  • Table 10 shows the relation between temperature and intensity of luminescence with pyrogallol and various oxidizers.

    The Nature of Animal Light E. Newton Harvey
  • Sumach is the other pyrogallol tan of commercial importance.

    Animal Proteins Hugh Garner Bennett
  • It is particularly advantageous to blend judiciously the two main types of material, the pyrogallol and catechol tans.

    Animal Proteins Hugh Garner Bennett
  • This is especially well seen in the action of various oxidizers on pyrogallol and H2O2 recorded in Table 10.

    The Nature of Animal Light E. Newton Harvey
  • Newton employs it in combination with pyrogallol and soda in the development of bromo-gelatine plates.

  • Thus the "maximum luminescence pressure" of pyrogallol increases with increase of temperature.

    The Nature of Animal Light E. Newton Harvey
  • Solutions of pyrogallol tans all give a blue-black colour with a dilute solution of ferric alum.

    Animal Proteins Hugh Garner Bennett
  • They are all, however, derived from either catechol or pyrogallol, and yield these substances if carefully heated to about 200 C.

    Animal Proteins Hugh Garner Bennett
British Dictionary definitions for pyrogallol


a white lustrous crystalline soluble phenol with weakly acidic properties; 1,2,3-trihydroxybenzene: used as a photographic developer and for absorbing oxygen. Formula: C6H3(OH)3
Derived Forms
pyrogallic, adjective
Word Origin
C20: from pyro- + gall(ic)² +-ol1
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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pyrogallol in Medicine

pyrogallol py·ro·gal·lol (pī'rō-gāl'ôl', -ōl', -gô'lôl', -lōl')
A white, toxic crystalline phenol used as a photographic developer and to treat certain skin diseases. Also called pyrogallic acid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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