A basic phenothiazine dye that is used as a stain and indicator in microbiology and histology, as an antiseptic, and as a treatment for methaemoglobinaemia.
Origin
Late 19th century; earliest use found in Journal of the Chemical Society.
Definition of methylene blue in US English:
methylene blue
noun
Chemistry
A basic phenothiazine dye that is used as a stain and indicator in microbiology and histology, as an antiseptic, and as a treatment for methaemoglobinaemia.
Origin
Late 19th century; earliest use found in Journal of the Chemical Society.