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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
nitrogen narcosis n.
Narcosis produced by nitrogenous materials such as those occurring in certain forms of uremia and hepatic coma.
A stuporous condition variously characterized by disorientation, euphoria, and loss of judgment and skill, attributed to nitrogen entering the blood during breathing of normal air at increased pressure, as occurs with deep-sea divers. Also called rapture of the deep.