n 1 : a condition that is marked by recurrent usu. unilateral 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 appear to be precipitated by dilatation of intracranial blood vessels 2 : an episode or attack of migraine <suffers from s> - called also sick headache mi*grain*ous adj
Similar sounding terms: mi·cron
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