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
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
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.