[gwahy-uh-kohl, -kawl]
noun Pharmacology.
  1. a slightly yellowish, aromatic, crystalline substance, C7H8O2, resembling creosote and usually obtained from guaiacum resin: used in medicine chiefly as an expectorant and local anesthetic.

Origin of guaiacol

First recorded in 1860–65; guaiac(um) + -ol2
Also called methylcatechol. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for guaiacol

Historical Examples of guaiacol

British Dictionary definitions for guaiacol


  1. a yellowish oily creosote-like liquid extracted from guaiacum resin and hardwood tar, used medicinally as an expectorant. Formula: C 7 H 8 O 2

Word Origin for guaiacol

from guaiac (um) + -ol ²
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

guaiacol in Medicine


[gwīə-kôl′, -kōl′]
  1. A yellowish, oily, aromatic substance derived from guaiacum or wood creosote and used chiefly as an expectorant, a local anesthetic, and an antiseptic.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.