Main Entry: mi·graine

Pronunciation: \ˈmī-ˌgrān, British often ˈmē-\

Function: noun

Etymology: Middle English mygreyn, from Middle French migraine, modification of Late Latin hemicrania pain in one side of the head, from Greek hēmikrania, from hēmi- hemi- + kranion cranium

Date: 15th century

1 : a condition marked by recurrent severe headache often with nausea and vomiting
2 : an episode or attack of migraine

— mi·grain·ous \-ˌgrā-nəs\ adjective