WordReference Random House Unabridged Dictionary of American English © 2026
Con′go red′, [Chem.]
  1. Chemistrya water-soluble powder, C32H22O6N6S2Na2, one of the Congo colors that is not acid-fast or lightfast: used chiefly as a dye, biological stain, and chemical indicator.
  • 1880–85

'Congo red' also found in these entries (note: many are not synonyms or translations):
benzidine

Forum discussions with the word(s) "Congo red" in the title:


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