\-ˈgal-ˌl, -ˌōl; -ˈg-ˌll, -ˌlōl\

Definition of PYROGALLOL

: a poisonous bitter crystalline phenol C6H6O3 with weak acid properties that is obtained usually by pyrolysis of gallic acid and that is used especially as a mild reducing agent (as in photographic developing) and in medicine as a topical antimicrobial (as in the treatment of psoriasis)

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