ruthenium red


Definition of ruthenium red

: an ammoniated ruthenium chloride obtained as a brownish red powder and used as a microscopic stain and as a test especially for pectin and gums

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 ruthenium red

1893, in the meaning defined above

Keep scrolling for more

Learn More about ruthenium red

Time Traveler for ruthenium red

Time Traveler

The first known use of ruthenium red was in 1893

See more words from the same year

Statistics for ruthenium red

Cite this Entry

“Ruthenium red.” Dictionary, Merriam-Webster, Accessed 24 Nov. 2020.

Comments on ruthenium red

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


Test Your Vocabulary

Great Scrabble Words—A Quiz

  • scrabble tiles that read scrabble quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

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!