First Known Use: 1885
Dictionary
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
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Origin of CONGO RED
Congo, territory in Africa
Medical Dictionary
Congo red
noun \ˌkäŋ-(ˌ)gō-ˈred\
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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