Definition of ob-gyn noun from the Oxford Advanced American Dictionary

     

    ob-gyn

     noun
    noun
    NAmE//ˌoʊ bi ˌdʒi waɪ ˈɛn//
     
    (informal)
     
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  1. 1[uncountable] the branches of medicine concerned with the birth of children (= obstetrics ) and the diseases of women (= gynecology )
  2. 2[countable] a doctor who is trained in this type of medicine
See the Oxford Advanced Learner's Dictionary entry: ob-gyn