Niddah
A niddah (alternative forms: nidda, nida, or nidah; Hebrew: נִדָּה nidá), in traditional Judaism, is a woman who has experienced a uterine discharge of blood (most commonly during menstruation), or a woman who has menstruated and not yet completed the associated requirement of immersion in a mikveh (ritual bath). In the Book of Leviticus, the Torah prohibits sexual intercourse with a niddah.