migraine \mi*graine"\, n. [F. migraine, LL. hemigrania, L.
hemicrania, hemicranium, Gr. "hmikrani`a; "hmi- half +
krani`on skull. See {Hemi-} and {Cranium}, and cf.
{Hemicrania}, {Migraine}.]
1. A kind of intense sick or nervous headache, usually
periodical and confined to one side of the head; called
also {migraine headache}. Same as {megrim}. --
{Mi*grain"ous}, a.
[1913 Webster]