thionine

== English == === Etymology === Of Ancient Greek [Term?] origin. See thio- (“sulfur”). === Noun === thionine (countable and uncountable, plural thionines) (chemistry) An artificial red or violet dyestuff consisting of a complex sulfur derivative of certain aromatic diamines. Synonym: Lauth's violet (organic chemistry) The unsaturated nine-membered heterocycle having eight carbon atoms, one sulfur atom and four double bonds. ==== Synonyms ==== phenylene violet