/ Thesaurus / M Synonyms of methylthionine chloride Find synonyms for: Noun1. methylene blue, methylthionine chloride, stain, thiazineusage: a dark green dye used as a stain, an antiseptic, a chemical indicator, and an antidote in cyanide poisoningWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: abyss Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language