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[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.
Origin of photometer
From the New Latin word photometrum, dating back to 1770-80. See photo-, -meter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for photometer
Historical Examples
  • An application of the law of intensity is made in using a simple (Bunsen) photometer.

    Physics Willis Eugene Tower
  • The photometer or instrument for accurate comparison of lights, their amount and intensity, tells a different story.

    Astronomy David Todd
  • A valve is then fitted to one of the front openings, so that the light in that half of the photometer may be gradually diminished.

    A Color Notation Albert H. Munsell
  • There is no other way of measuring the exposure than by the photometer or personal experience, and the latter is by far the best.

  • A number of measurements of the illuminating power of an electric lamp were rapidly made during the lecture with this photometer.

  • The photometer, preferably one of the Lummer-Brodhun form, is set up on a gallery or bench.

  • The photometer may show a very adequate intensity of illumination; nevertheless seeing may be unsatisfactory or even impossible.

    Visual Illusions Matthew Luckiesh
  • In such a case the photometer yielded results quite likely to be misinterpreted as satisfactory.

    Visual Illusions Matthew Luckiesh
  • The photometer has played an important rôle in establishing the scientific basis of camouflage.

    Visual Illusions Matthew Luckiesh
British Dictionary definitions for photometer


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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