Me·grim n.
  1. A kind of sick or nervous headache, usually periodical and confined to one side of the head; now more commonly called migraine headache or migraine.
  2. A fancy; a whim; a freak; a humor; esp., in the plural, lowness of spirits.
     These are his megrims, firks, and melancholies.   --Ford.
  3. pl. Far. A sudden vertigo in a horse, succeeded sometimes by unconsciousness, produced by an excess of blood in the brain; a mild form of apoplexy.
  mi·graine n.
  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.
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