involving sex between two people in a family who are very closely related 乱伦的；血亲相奸的 an incestuous relationship 乱伦关系
- (disapproving)
involving a group of people who have a close relationship and do not want to include anyone outside the group 小集团的；小团体的；排外的
Word Originearly 16th cent.: from late Latin incestuosus, from Latin incestus, incestum ‘unchastity, incest’, from in- ‘not’ + castus ‘chaste’.