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photometer

[foh-tom-i-ter] /foʊˈtɒm ɪ tər/
noun, Optics.
1.
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.
Origin of photometer
1770-1780
1770-80; < New Latin photometrum. See photo-, -meter
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for photometer

photometer

/fəʊˈtɒmɪtə/
noun
1.
an instrument used in photometry, usually one that compares the illumination produced by a particular light source with that produced by a standard source See 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
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