definition for sulfur
sulfur. noun sulÂ·fur \ËsÉl-fÉr\. Tweet. chemistry: a yellow chemical element that has a strong, unpleasant odor when it is burned and that is used in making paper, gunpowder, medicine, etc.earn More About SULFUR. Spanish Central: Spanish translation of sulfur. Nglish: Translation of sulfur for Spanish speakers. Britannica English: Translation of sulfur for Arabic speakers.