n181. It is forbidden to eat a "Terefah" (Shemot 22:30).
Zav and Zavah are states of ritual impurity in Judaism arising from abnormal bodily discharges; for men the state is termed zav, and for women it is termed zavah. The Jewish regulations and existence of these states have a biblical basis, and further specification of these rules exists in the Jewish Oral Law; Orthodox Judaism views the Shulchan Aruch as being particularly authoritative on these matters, and it has extensive discussion about the subject. Normal menstruation is explicitly excluded from the biblical regulations concerning zavah, and is treated with separate requirements known as niddah; the ejaculation of semen is also treated as being distinct from zav, and is given requirements known as keri.