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
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of thioindigo
International Scientific Vocabulary thi- + indigo
Seen and Heard
What made you want to look up thioindigo? Please tell us where you read or heard it (including the quote, if possible).