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Webster 1913 Edition

Noun.

[Pyro

gall

ol + phthal

eïn

(Chem.)

A red crystalline dyestuff, obtained by heating together pyrogallic and phthalic acids.

gallein ‎(countable and uncountable, plural galleins)

(organic chemistry) A red crystalline dyestuff obtained by heating pyrogallic acid and phthalic acid together.