Congo red

noun
Con·​go red | \ ˈkäŋ-(ˌ)gō- How to pronounce Congo red (audio) \

Definition of Congo red

: an azo dye C32H22N6Na2O6S2 that is red in alkaline and blue in acid solution and that is used especially as an indicator and as a biological stain

First Known Use of Congo red

1885, in the meaning defined above

History and Etymology for Congo red

Congo, territory in Africa

Keep scrolling for more

Learn More about Congo red

Time Traveler for Congo red

Time Traveler

The first known use of Congo red was in 1885

See more words from the same year

Statistics for Congo red

Cite this Entry

“Congo red.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Congo%20red. Accessed 5 Dec. 2020.

Keep scrolling for more

More Definitions for Congo red

Congo red

noun
\ ˌkäŋ-(ˌ)gō-ˈred How to pronounce Congo red (audio) \

Medical Definition of Congo red

: an azo dye C32H22N6Na2O6S2 that is red in alkaline and blue in acid solution and that is used in a number of diagnostic tests and especially for the detection of amyloidosis since the injected dye tends to be retained by abnormal amyloid deposits

Comments on Congo red

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

WORD OF THE DAY

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

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

TAKE THE QUIZ
Love words? Need even more definitions?

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