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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. |
| devolution (ˌdiːvəˈluːʃən) | |
| —n | |
| 1. | the act, fact, or result of devolving |
| 2. | a passing onwards or downwards from one stage to another |
| 3. | another word for degeneration |
| 4. | a transfer or allocation of authority, esp from a central government to regional governments or particular interests |
| [C16: from Medieval Latin dēvolūtiō a rolling down, from Latin dēvolvere to roll down, sink into; see | |
| devo'lutionary | |
| —adj | |
| devo'lutionist | |
| —n, —adj | |