(n.) A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and hence called also pyrogallic acid. It is a strong reducer, and is used as a developer in photography and in the production of certain dyes.
PYROGALLOL
Meaning of PYROGALLOL in English
Webster's English dictionary. Английский словарь Webster. 2012