Dictionary.com
Thesaurus.com

orcinol

American  
[awr-suh-nawl, -nol] / ˈɔr səˌnɔl, -ˌnɒl /
Also orcin

noun

Chemistry.
  1. a white, crystalline, water-soluble solid, C 7 H 8 O 2 , sweet but unpleasant in taste, that reddens on exposure to air: obtained from many lichens or produced synthetically and used chiefly as a reagent for certain carbohydrates.


orcinol British  
/ ˈɔːsɪˌnɒl, ˈɔːsɪn /

noun

  1. a colourless crystalline water-soluble solid that occurs in many lichens and from which the dyes found in litmus are derived. Formula: CH 3 C 6 H 3 (OH) 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

Etymology

Origin of orcinol

1875–80; < New Latin orcin ( a ) (< Italian orcello orchil, by alteration) + -ol 2