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8 Words That Are Older Than You Think

thionine

/ˈθaɪəʊˌniːn; -ˌnaɪn/
noun
1.
a crystalline derivative of thiazine used as a violet dye to stain microscope specimens
2.
any of a class of related dyes
Word Origin
C19: by shortening, from ergothioneine, a crystalline betaine found in ergot and blood
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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