1.NounA severe, disabling headache, usually affecting only one side of the head, and often accompanied by nausea, vomiting, photophobia and visual disturbances.
"He had a headache so bad that he wished he was dead, but it was the sort of migraine that promised him he would continue to suffer but not die.; After consuming too much coffee every day for six weeks, she got severe migraines that would last up until 47 minutes after her first cup of coffee."
2.NounA neurological condition characterised by such headaches.