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noun, Physics.
a measure of radiation based on the ability to produce ionization: expressed in roentgens.


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    noun, Photography. 1. an instrument for measuring the intensity of light in a certain place or upon a certain object, having an adjustable scale for determining the optimum relations of shutter speeds and stops at each intensity. noun 1. (photog) an instrument for measuring the intensity of light, usually by means of a photocell, so […]

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