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| a chattering or flighty, light-headed person. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| principal axis | |
| —n | |
| 1. | the line passing through the optical centre and centres of curvature of the faces of a lens or a curved mirror |
| 2. | any of three mutually perpendicular axes about which the moment of inertia of a body is maximum |