actinometer

noun
ac·ti·nom·e·ter | \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

Other Words from actinometer

actinometric \-nō-ˈme-trik \ adjective
actinometry \-ˈnä-mə-trē \ noun

First Known Use of actinometer

1833, in the meaning defined above

History and Etymology for actinometer

actino- + -meter

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The first known use of actinometer was in 1833

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actinometer

noun
ac·ti·nom·e·ter | \ˌak-tə-ˈnäm-ət-ər \

Medical 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

Other Words from actinometer

actinometric \-nō-ˈme-trik \ adjective
actinometry \-ˈnäm-ə-trē \ noun plural actinometries

More from Merriam-Webster on actinometer

Britannica.com: Encyclopedia article about actinometer

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