methylene blue methylene • methylene chloride · · · Info · Definitions · Synonyms · Characters · · methylene blue · · Text Common · · Latin · · Scripts 14 · · Length 4 · · Syllables Definitions · · · (noun) a dark green dye used as a stain, an antiseptic, a chemical indicator, and an antidote in cyanide poisoning. Synonyms: methylene blue, methylthionine chloride. · · Noun Definition 1 Synonyms · · · methylthionine chloride · · Synonym 1 Characters · · space U+0020 b latin small letter b U+0062 e latin small letter e U+0065 h latin small letter h U+0068 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E t latin small letter t U+0074 u latin small letter u U+0075 y latin small letter y U+0079