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The Collaborative International Dictionary of English v.0.48 (gcide)

Pyrocatechin \Pyr`o*cat"e*chin\, n. [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.
[1913 Webster]


catechol \cat"e*chol\ (k[a^]t"[e^]*k[add]l`), n. [.]
any of a group of chemicals having a benzene ring substituted
with two hydroxyl groups in ortho position, especially
ortho-dihydroxybenzene itself ({C6H6O2}), also called
{pyrocatechol}, used in photography and as a reagent.
[PJC]

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