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

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!

History and Etymology for thioindigo

International Scientific Vocabulary thi- + indigo

Keep scrolling for more

Learn More about thioindigo

Share thioindigo

Statistics for thioindigo

Look-up Popularity

Comments on thioindigo

What made you want to look up thioindigo? Please tell us where you read or heard it (including the quote, if possible).


a state of commotion or excitement

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!