[pahy-ruh-gal-awl, -ol, -guh-lawl, -lol]
  1. 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.

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

British Dictionary definitions for pyrogallic-acid


  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
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

pyrogallic-acid in Medicine


[pī′rō-gălôl′, -ōl′, -gôlôl′, -lōl′]
  1. 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.