The Collaborative International Dictionary
Thionol
Thionol \Thi"on*ol\, n. [Thionine + -ol.] (Chem.) A red or violet dyestuff having a greenish metallic luster. It is produced artificially, by the chemical dehydration of thionine, as a brown amorphous powder.
Wiktionary
thionol
n. (context organic compound English) A red or violet dyestuff with a greenish metallic lustre, produced by the chemical dehydration of thionine.