noun, often capitalized
variants: or tropeolin \ trōˈpēələ̇n \
plural -s

Definition of tropaeolin

: any of several orange or orange-yellow azo dyes some of which (as methyl orange) are used as acid-base indicators or as biological stains

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!

First Known Use of tropaeolin

1878, in the meaning defined above

History and Etymology for tropaeolin

International Scientific Vocabulary tropaeol- (from New Latin Tropaeolum) + -in

Keep scrolling for more

Learn More about tropaeolin

Time Traveler for tropaeolin

Time Traveler

The first known use of tropaeolin was in 1878

See more words from the same year

Statistics for tropaeolin

Cite this Entry

“Tropaeolin.” Dictionary, Merriam-Webster, Accessed 26 Jan. 2021.

Comments on tropaeolin

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


Test Your Vocabulary

Slippery Words Quiz—Changing with the Times

  • ducreux self portrait yawning
  • What is an earlier meaning of nice?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

 AlphaBear 2

Spell words. Make bears.

Love words? Need even more definitions?

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