Dictionary

Congo red

Congo red

noun Con·go red \ˈkäŋ-(ˌ)gō-\

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

Origin of CONGO RED

Congo, territory in Africa
First Known Use: 1885

Congo red

noun \ˌkäŋ-(ˌ)gō-ˈred\   (Medical Dictionary)

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

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