actinometer
ac·ti·nom·e·ter
noun \ˌak-tə-ˈnä-mə-tər\Definition of ACTINOMETER
: any of various instruments for measuring the intensity of incident radiation; especially : one in which the intensity of radiation is measured by the speed of a photochemical reaction
— ac·ti·no·me·tric \-nō-ˈme-trik\ adjective
— ac·ti·nom·e·try \-ˈnä-mə-trē\ noun
First Known Use of ACTINOMETER
1833
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