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| 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. |
in advance
Beforehand, ahead of time. For example, He insisted on being paid half his fee in advance.
in advance of. In front of, as in The point man moved in advance of the squad. [Mid-1600s]