Definition of toluidine blue
: a basic thiazine dye that is related to methylene blue and is used as a biological stain
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First Known Use of toluidine blue
1898
Medical Dictionary
toluidine blue
medical Definition of toluidine blue
: a basic thiazine dye that is related to methylene blue and is used as a biological stain and especially formerly as an antihemorrhagic drug — called also
tolonium chloride
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