incest(redirected from Sibling incest)
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1. Sexual relations between persons who are so closely related that their marriage is illegal or forbidden by custom.
2. The crime of sexual relations with a person defined by statute as too closely related.
sexual intercourse between two persons commonly regarded as too closely related to marry
[C13: from Latin incestus incest (from adj: impure, defiled), from in-1 + castus chaste]
1. sexual relations between persons so closely related that they are forbidden by law or religion to marry.
2. the crime of sexual relations, cohabitation, or marriage between such persons.