In biblical terms, a Niddah is a woman experiencing a menstrual flow who is thus required to abstain from intimacy with her husband and renders impure items that are susceptible to ritual impurity. After the destruction of the Second Temple, the latter concern fell away and the term comes to refer also to an entire category of Jewish ritual purity law that governs the intimate relations between a husband a wife, also sometimes known as the laws of family purity.
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