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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
menstruum men·stru·um (měn'str&oomacr;-əm)
n. pl. men·stru·ums or men·stru·a (-str&oomacr;-ə)
A solvent, especially one used in extracting compounds from plant and animal tissues and preparing drugs.