[ pahy-ruh-gal-awl, -ol, -guh-lawl, -lol ]
/ ˌpaɪ rəˈgæl ɔl, -ɒl, -gəˈlɔl, -ˈlɒl /


a white, crystalline, water-soluble, poisonous, solid, phenolic compound, C6H3(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.

Nearby words

  1. pyroconductivity,
  2. pyrocrystalline,
  3. pyroelectric,
  4. pyroelectricity,
  5. pyrogallate,
  6. pyrogen,
  7. pyrogenetic,
  8. pyrogenic,
  9. pyrogenous,
  10. pyroglobulin

Origin of pyrogallol

First recorded in 1875–80; pyro- + gall(ic)2 + -ol1

Also called pyrogallic acid.

Related formspy·ro·gal·lic [pahy-ruh-gal-ik, -gaw-lik] /ˌpaɪ rəˈgæl ɪk, -ˈgɔ lɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for pyrogallol

British Dictionary definitions for pyrogallol


/ (ˌpaɪrəʊˈɡælɒl) /


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
Derived Formspyrogallic, adjective

Word Origin for pyrogallol

C20: from pyro- + gall (ic)² + -ol 1

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

Medicine definitions for pyrogallol


[ pī′rō-gălôl′, -ōl′, -gôlôl′, -lōl′ ]


A white, toxic crystalline phenol used as a photographic developer and to treat certain skin diseases.pyrogallic acid

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