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actinometer
ac·ti·nom·e·ter [ àktə nómmətər ] (plural ac·ti·nom·e·ters)


noun 
Definition:
 
radiation meter: a device for measuring the intensity of radiation, especially that from the Sun

ac·ti·no·met·ric [ àktənō méttrik ] adjective
ac·ti·nom·e·try [ àktə nómmətree ] noun
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