thionine

World English Dictionary
thionine or thionin (ˈθaɪəʊˌniːn, -ˌnaɪn, ˈθaɪənɪn)
 
n
1.  a crystalline derivative of thiazine used as a violet dye to stain microscope specimens
2.  any of a class of related dyes
 
[C19: by shortening, from ergothioneine, a crystalline betaine found in ergot and blood]
 
thionin or thionin
 
n
 
[C19: by shortening, from ergothioneine, a crystalline betaine found in ergot and blood]

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American Heritage
Medical Dictionary

thionine thi·o·nine (thī'ə-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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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