gallotannic acid

[gal-uh-tan-ik as-id]

noun

Chemistry

1. a form of tannic acid, found in oak galls.

Word History and Origins

Origin of gallotannic acid¹

First recorded in 1855–60; from Latin gall(a) “gallnut” + -o- ( def. ) + tannic (acid) ( def. ); gall ³ ( def. ), tannic

Example Sentences

The technique detects the presence of iron contained in "iron gall ink" which was typically produced by adding a source of iron, such as nails, to gallotannic acid.

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A soft, unctuous form results on treating carbon with ash or silica in special furnaces, and this gives the so-called “deflocculated” variety when treated with gallotannic acid.

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