thioindigoid dye
noun
variants
or less commonly thioindigoid
: any of a class of vat dyes characterized by the same chromophore as indigo (see indigo sense 1b) but with sulfur instead of an imino group as an auxochrome compare indigoid dye
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“Thioindigoid dye.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thioindigoid%20dye. Accessed 30 Nov. 2024.
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