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Definitions Found:

An instrument for measuring the intensity of radiation, typically ultraviolet radiation

actinometerAn instrument for measuring the intensity of radiation, typically ultraviolet radiation
actinometersAn instrument for measuring the intensity of radiation, typically ultraviolet radiation
radiometerAn instrument for detecting or measuring the intensity or force of radiation

radiometersAn instrument for detecting or measuring the intensity or force of radiation
pyrgeometeran instrument for measuring the loss of heat by radiation from the earth's surface
pyrgeometersPYRGEOMETER, an instrument for measuring the loss of heat by radiation from the earth's surface
phosphoroscopean instrument for measuring the duration of phosphorescence after the source of radiation causing it has been removed
phosphoroscopesPHOSPHOROSCOPE, an instrument for measuring the duration of phosphorescence after the source of radiation causing it has been removed
colorimeterAn instrument for measuring the intensity of color
photometersAn instrument for measuring the intensity of light
photometerAn instrument for measuring the intensity of light
colorimetersAn instrument for measuring the intensity of color
magnetometeran instrument for measuring the intensity of magnetic fields

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.