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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. |
Alder Al·der (äl'dər), Kurt. 1902-1958.
German chemist. He shared a 1950 Nobel Prize for discoveries concerning the structure of organic matter.