| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
(Heb., "the all-demanding world" = Gr. Hades, "the unknown region"), the invisible world of departed souls. (See HELL.)