thionine

[ thahy-uh-neen, ‐nin ]
/ ˈθaɪ əˌnin, ‐nɪn /

noun Biochemistry.

a dark-green crystalline powder, C12H10N3S, whose property of turning violet in solution is useful in microscopy as a biological stain.

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Origin of thionine

First recorded in 1885–90; from Greek theîon “sulfur” (see thio-) + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for thionine

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
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

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