'Thionol' definitions:

Definition of 'Thionol'

From: GCIDE

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. [1913 Webster]