migraine

mi·graine   (mī'grān')    n.  A severe recurring headache, usually affecting only one side of the head, characterized by sharp pain and often accompanied by nausea, vomiting, and visual disturbances. Also called megrim. [Middle English, from Old French, from Late Latin hēmicrānia, from Greek hēmikrāniā : hēmi-, hemi- + krānion, head; see ker-1 in Indo-European roots.] mi·grain'ous adj.

migraine 

Main Entry: mi·graine
Pronunciation: 'mI-"grAn, Brit often 'mE-
Function: noun
1 : a condition that is marked by recurrent usuallyunilateral severe headache often accompanied by nausea and vomiting and followed by sleep, that tends to occur in more than one member of a family, and that is of uncertain origin though attacks appearto be precipitated by dilatation of intracranial blood vessels
2 : an episode or attack of migraine migraines> called also sick headache —mi·grain·ous /-"grA-n&s/ adjective

migraine mi·graine (mī'grān')
n.
A severe recurring headache, usually affecting only one side of the head, that is characterized by sharp pain and is often accompanied by nausea, vomiting, and visual disturbances. Also called hemicrania, megrim, sick headache.

migraine   (mī'grān')  Pronunciation Key  A severe recurring headache, usually affecting only one side of the head, that is characterized by sharp, throbbing pain and is often accompanied by nausea, vomiting, sensitivity to light, and visual disturbances. Vasodilation in the brain causes inflammation that results in pain, but the exact cause of migraine is unknown.