n.
Pronunciation: ˌ p ī -r ō - ' ga- ˌ lo ̇ l, - ˌ l ō l; - ' go ̇ -
Function: noun
Etymology: International Scientific Vocabulary pyro- + gall ic (acid) + 1 -ol
Date: 1869
: a poisonous bitter crystalline phenol C 6 H 6 O 3 with weak acid properties that is usually obtained by pyrolysis of gallic acid and used especially as a mild reducing agent (as in photographic developing)