Definition of incestuous adjective from the Oxford Advanced Learner's Dictionary

     

    incestuous

     adjective
    adjective
    BrE BrE//ɪnˈsestjuəs//
     
    ; NAmE NAmE//ɪnˈsestʃuəs//
     
     
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  1. 1involving sex between two people in a family who are very closely related an incestuous relationship
  2. 2(disapproving) involving a group of people who have a close relationship and do not want to include anyone outside the group The music industry is an incestuous business.
  3. Word Origin early 16th cent.: from late Latin incestuosus, from Latin incestus, incestum ‘unchastity, incest’, from in- ‘not’ + castus ‘chaste’.
See the Oxford Advanced American Dictionary entry: incestuous