Congo red
noun
Con·go red
ˈkäŋ-(ˌ)gō- 
: 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
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“Congo red.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Congo%20red. Accessed 1 Dec. 2024.
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Congo red
noun
Con·go red
ˌkäŋ-ˌgō-
: a dye that is red in alkaline and blue in acid solution
Etymology
named for Congo, territory in Africa
Medical Definition
Congo red
noun
: 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
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