| NOUN | substance | methylthionine chloride, methylene blue | a dark green dye used as a stain, an antiseptic, a chemical indicator, and an antidote in cyanide poisoning |
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| Meaning | A dark green dye used as a stain, an antiseptic, a chemical indicator, and an antidote in cyanide poisoning. | |
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| Synonym | methylene blue | |
| Broader | stain | (microscopy) a dye or other coloring material that is used in microscopy to make structures visible |
| thiazine | A compound made up of a ring of four carbon atoms and one sulfur atom and one nitrogen atom | |