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Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Any azo derivative of a sulfamide, but especially any salt of 6-acetamido-4-oxo-3-[(4-sulfamoylphenyl)hydrazinylidene]naphthalene-2,7-disulfonic acid use as a sulfa drug Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.