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Webster 1913 Edition

Noun.

[

Pyro-

catechu

(Chem.)

A white crystalline substance,

C6H4(OH)2

, of the phenol series, found in various plants; – so called because first obtained by distillation of gum catechu. Called also

catechol

oxyphenol

. etc.

pyrocatechin ‎(plural pyrocatechins)