photometer Meaning, Definition & Usage

  1. noun measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source
  2. noun photographic equipment that measures the intensity of light
    light meter; exposure meter.

WordNet

Pho*tom"e*ter noun
Etymology
Photo- + -meter: cf. F. photomètre.
Definitions
  1. (Physics) An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.

Webster 1913