Migraine is a neurological disorder characterized by intense, recurring headaches. It is often accompanied by nausea, vomiting, and sensitivity to light and sound. The term 'migraine' is derived from the Greek word 'hemikrania, ' which means 'half-skull.' Megrim, with 6 letters, is an old-fashioned term for migraine, while HEADACHE, with 8 letters, is a more general term for any type of pain in the head.