congo red congo peafowl • congo river · · · Info · Definitions · Characters · · congo red · · Text Common · · Latin · · Scripts 9 · · Length 3 · · Syllables Definitions · · · (noun) a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions). Synonyms: congo red. · · Noun Definition 1 Characters · · space U+0020 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072