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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
1770-1780
1770-80; < Neo-Latin photometrum. See photo-, -meter
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for photo-meter

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
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Encyclopedia Article for photo-meter

photometer

device that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared and including the visible spectrum. Such devices are generally transducers that convert an electric current into a mechanical indication-e.g., a pointer moving across a dial. The source of the current may be a selenium cell, which generates a current when light falls on it, or it may be a permanent source, such as a battery, in which case the current passes through a cadmium sulfide cell whose resistance varies with the amount of light falling on it.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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