noun
methylene blue
A synthetic dye used as a stain in biology and medicine, and as a medication for methemoglobinemia.
メチレンブルーは顕微鏡観察の染色に使われる。
Methylene blue is used for staining in microscopy.
Variant with interpunct; less common but seen in some technical contexts.
From German 'Methylenblau' or English 'methylene blue'.