Medical Dictionary
thionine
noun thi·o·nine \ˈthī-ə-ˌnēn, -nən\
Medical Definition of THIONINE
: a dark crystalline basic thiazine dye that is used chiefly as a biological stain
Seen & Heard
What made you want to look up thionine? Please tell us where you read or heard it (including the quote, if possible).