| incest | Sexual activity between individuals so closely related that marriage is prohibited. Incest involving a child is a form of child abuse. (12 Dec 1998) |
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| incest barrier | In psychoanalysis, the learning or internalization of parental and social prohibitions against incest. (05 Mar 2000) |
| incestuous | 1. Pertaining to incest. 2. Guilty of incest. (05 Mar 2000) |