thionine

thionin (ˈθaɪənɪn)

/ (ˈθaɪəʊˌniːn, -ˌnaɪn) /

noun

a crystalline derivative of thiazine used as a violet dye to stain microscope specimens
any of a class of related dyes

Word Origin for thionine

C19: by shortening, from ergothioneine, a crystalline betaine found in ergot and blood

Medical definitions for thionine

thionine
[ thīə-nēn′, -nĭn ]

n.

A dark-green powder that turns water purple when mixed in solution, used as a basic stain in histology for chromatin and mucin because of its metachromatic properties.