The Collaborative International Dictionary
Gallein
Gallein \Gal"le*["i]n\, n. [Pyrogallol + phthale["i]n.] (Chem.) A red crystalline dyestuff, obtained by heating together pyrogallic and phthalic acids.
Wiktionary
gallein
n. (context organic compound English) A red crystalline dyestuff obtained by heating pyrogallic acid and phthalic acid together.