/gwuy"euh kohl', -kawl'/ , n. Pharm.
a slightly yellowish, aromatic, crystalline substance, C 7 H 8 O 2 , resembling creosote and usually obtained from guaiacum resin: used in medicine chiefly as an expectorant and local anesthetic.
Also called methylcatechol .
[ 1860-65; GUAIAC(UM) + -OL 2 ]