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photometer noun

  /fəˈtɑmɪtɚ/ , /fəˈtɒmɪtə(ɹ)/ , /ˈfoʊtoʊˌmitɚ/ , /ˈfəʊtəʊˌmiːtə(ɹ)/
  • (physics) Any of several instruments used to measure various aspects of the intensity of light.
 фото́метр, фотометр
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