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thionine

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

noun

Biochemistry.

  1. a dark-green crystalline powder, C 12 H 10 N 3 S, whose property of turning violet in solution is useful in microscopy as a biological stain.

thionine British  
/ ˈθaɪənɪn, -ˌnaɪn, ˈθaɪəʊˌniːn /

noun

  1. a crystalline derivative of thiazine used as a violet dye to stain microscope specimens

  2. any of a class of related dyes

"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

Etymology

Origin of thionine

First recorded in 1885–90; from Greek theîon “sulfur” ( thio- ( def. ) ) + -ine 2 ( def. )

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.