pyrogallol

American  

[pahy-ruh-gal-awl, -ol, -guh-lawl, -lol] / ˌpaɪ rəˈgæl ɔl, -ɒl, -gəˈlɔl, -ˈlɒl /

noun

1. a white, crystalline, water-soluble, poisonous, solid, phenolic compound, C 6 H 3 (OH) 3 , obtained by heating gallic acid and water: used chiefly as a developer in photography, as a mordant for wool, in dyeing, and in medicine in the treatment of certain skin conditions.

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pyrogallol British  

/ ˌpaɪrəʊˈɡælɒl /

noun

1. a white lustrous crystalline soluble phenol with weakly acidic properties; 1,2,3-trihydroxybenzene: used as a photographic developer and for absorbing oxygen. Formula: C 6 H 3 (OH) 3

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Other Word Forms

• pyrogallic adjective

Etymology

Origin of pyrogallol

First recorded in 1875–80; pyro- + gall(ic) ² + -ol ¹

Example Sentences

Gallic acid is a type of pyrogallol and is primarily found in coffees and teas.

From Time

The one called the pyrogallol group, which includes sumac, gall nuts and oak bark, is commended by the Committee of the Society of Arts.

From Project Gutenberg

An alkaline solution of pyrogallol is also used; this solution rapidly absorbs oxygen, becoming black in colour, and it is necessary to prepare the solution immediately before use.

From Project Gutenberg

The pyrogallol method of Preisz also proved to be unreliable in his hands.

From Project Gutenberg

The tannins are divided into two general classes, known respectively as the pyrogallol tannins and the catechol tannins.

From Project Gutenberg