Pyrogallol definitions

pī'rō-găl'ôl', -ōl', -ŏl', -gô'lôl', -lōl', -lŏl'
A white, toxic crystalline phenol, C6 H3 (OH)3 , used as a photographic developer and to treat certain skin diseases.
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A poisonous, white, crystalline phenol, C6H3(OH)3, produced by heating gallic acid: used in medicine, as a developer in photography, etc.
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A white, toxic crystalline phenol, C6 H3 (OH)3 , used as a photographic developer and to treat certain skin diseases.
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(organic chemistry) A poisonous trihydroxy phenol, 1,2,3-trihydroxybenzene, C6H3(OH)3, used is a photographic developer.
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Origin of pyrogallol

pyro– gall(ic acid) –ol