Used externally in the treatment of psoriasis, ringworm, and other skin affections. SYN: pyrogallic acid.
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py·ro·gal·lol -'gal-.ȯl, -.ōl; -'gȯ-.lȯl, -.lōl n a poisonous bitter crystalline phenol C6H6O3 with weak acid properties that is obtained usu. by pyrolysis of gallic acid and that is used esp. 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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py·ro·gal·lol (pi″ro-galґol) a poisonous acid derived from gallic acid, used as a reagent, photographic developer, mordant for wool, and dye constituent. Called also pyrogallic acid.Medical dictionary. 2011.