|a sensitive instrument for measuring radiant energy by the increase in the resistance of an electrical conductor|
|[C19: from bol-, from Greek bolē ray of light, stroke, from ballein to throw + |
|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.|
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