n181. It is forbidden to eat a "Terefah" (Shemot 22:30).

Terefah

any food, food product, or utensil that, according to the Jewish dietary laws (Kashrut, q.v.), is not ritually clean or prepared according to law and is thus prohibited as unfit for Jewish use. Terefah is thus the antithesis of kosher (ˇ°fitˇ±). The broad connotation of terefah derives from a more specific prohibition against eating meat that has been ˇ°tornˇ± by a...

Kashrut

...and birds must be slaughtered according to a ritual that, if violated, makes the meat ˇ°unfitˇ± for use. Food ritually unfit, for whatever reason, is called ˇ°forbiddenˇ± (terefah), the opposite of kosher (ˇ°fit,ˇ± or ˇ°properˇ±). Because animal blood may not be eaten, meat must undergo a ritual process of presoaking and ˇ°saltingˇ±...

kosher

...kosher is also used to describe, for instance, such objects as a Torah scroll, water for ritual bathing (mikvah), and the ritual ram's horn (shofar). When applied to food, kosher is the opposite of terefah (ˇ°forbiddenˇ±); when applied to other things, it is the opposite of pasul (ˇ°unfitˇ±).

 

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[1][2], 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[3], and is treated with separate requirements known as niddah[4]; the ejaculation of semen is also treated as being distinct from zav, and is given requirements known as keri[5].

Gid haNasheh - The Forbidden Vein

Whether one may not eat it: Pesachim 22a
Whether one may not Benefit from it: Pesachim 22a
Forbidden Vein from a Wild Animal: Pesachim 23b
Eating the Forbidden Vein from a Corpse: Pesachim 47b; Makkot 22a
Whether the vein is permitted for benefit along with the Corpse containing it: Pesachim 23b
Whether Veins are considered to be Meat and contribute taste, or not: Pesachim 22a, 23b
Whether there is an extra prohibition against the Forbidden Vein from a Forbidden Species: Pesachim 22a
Lashes for eating this: Makkot 21b
Liability for cooking and eating gid hanasheh [sciatic neurovascular bundle] in milk on Yom Tov: Beitzah 12a-b