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Wordnet Dictionary
Noun sick headache has 2 senses
  1. sick headache - a headache accompanied by nausea
    --1 is a kind of     headache, head ache, cephalalgia
  2. migraine, megrim, sick headache, hemicrania - a severe recurring vascular headache; occurs more frequently in women than men
    --2 is a kind of headache, head ache, cephalalgia
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