Definition of phobia noun from the Oxford Advanced American Dictionary

     

    phobia

     noun
    noun
    NAmE//ˈfoʊbiə//
     
     
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  1. 1a strong unreasonable fear of something He has a phobia about flying. One of the symptoms of the disease is water phobia.
  2. 2-phobia (in nouns) a strong unreasonable fear or hatred of a particular thing claustrophobia xenophobia compare -philia
See the Oxford Advanced Learner's Dictionary entry: phobia