photometer

[ foh-tom-i-ter ]
/ foʊˈtɒm ɪ tər /

noun Optics.

an instrument that measures luminous intensity or brightness, luminous flux, light distribution, color, etc., usually by comparing the light emitted by two sources, one source having certain specified standard characteristics.

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Origin of photometer

From the New Latin word photometrum, dating back to 1770–80. See photo-, -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for photometer

photometer
/ (fəʊˈtɒmɪtə) /

noun

an instrument used in photometry, usually one that compares the illumination produced by a particular light source with that produced by a standard sourceSee also spectrophotometer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012