| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
tref
any food, food product, or utensil that, according to the Jewish dietary laws (kashruth, 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 ("fit"). The broad connotation of terefah derives from a more specific prohibition against eating meat that has been "torn" by a wild animal (e.g., Exodus 22:31).
Learn more about tref with a free trial on Britannica.com.