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Webster 1913 Edition
Pyrogallol
Pyrˊo-gal′lol
,Noun.
[
Pyrogallic
+ -ol
.] (Chem.)
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.