thioindigo

noun
thio·indigo | \¦thī(ˌ)ō+\

Definition of thioindigo 

1 : a red vat dye C16H8O2S2 like indigo in chemical structure except for replacement of both imino groups by sulfur atoms

2 : any of several vat dyes derived from or closely related to thioindigo

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History and Etymology for thioindigo

International Scientific Vocabulary thi- + indigo

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