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thionine

thionin (ˈθaɪənɪn)

noun
  1. a crystalline derivative of thiazine used as a violet dye to stain microscope specimens
  2. any of a class of related dyes
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Word Origin

C19: by shortening, from ergothioneine, a crystalline betaine found in ergot and blood
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

thionine in Medicine

thionine

(thīə-nēn′, -nĭn)
n.
  1. 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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.