ochronosis: an accumulation of dark pigment in cartilage and other connective tissue; usually a symptom of alkaptonuria or phenol poisoning
symptom: (medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease
mantoux test: tuberculin (a derivative of tubercle bacillus) is injected intradermally; a red area appearing 1-3 days later signifies an exposure (past or present) to tubercle bacilli and the need for further testing