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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| aviation medicine | |
| —n | |
| Compare space medicine the branch of medicine concerned with the effects on man of flight in the earth's atmosphere | |