thioindigo

noun

thio·​indigo

¦thī(ˌ)ō+

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

Word History

Etymology

International Scientific Vocabulary thi- + indigo

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now