actinometer

(ak′tə nämət ər)

noun

  1. Physics an instrument for measuring the intensity of the sun's rays, or the actinic effect of light rays
  2. Photog. exposure meter

Related Forms:

See actinometer in American Heritage Dictionary 4

noun
Any of several radiometric instruments, such as a pyrheliometer, used chiefly for meteorological measurements of terrestrial and solar radiation.

Related Forms:

  • acˌti·no·metˈric (-nō-mĕtˈrĭk), acˌti·no·metˈri·cal adjective
  • acˌti·nomˈe·try noun

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