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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. |
| concentric (kənˈsɛntrɪk) | |
| —adj | |
| Compare eccentric having a common centre: concentric circles | |
| [C14: from Medieval Latin concentricus, from Latin com- same + centrum | |
| con'centrically | |
| —adv | |
| concentricity | |
| —n | |