/ Dictionary / Index C Congo red: Meaning and Definition of Find definitions for: Con'go red' Pronunciation: [key] — Chem. Chem. a water-soluble powder, CHONSNa, one of the Congo colors that is not acid-fast or lightfast: used chiefly as a dye, biological stain, and chemical indicator. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Congolese congo snake Related Content Daily Word Quiz: reluctant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language