actinometer

noun
ac·​ti·​nom·​e·​ter | \ ˌak-tə-ˈnä-mə-tər How to pronounce actinometer (audio) \

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 How to pronounce actinometric (audio) \ adjective
actinometry \ -​ˈnä-​mə-​trē How to pronounce actinometry (audio) \ 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 How to pronounce actinometer (audio) \

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 How to pronounce actinometric (audio) \ adjective
actinometry \ -​ˈnäm-​ə-​trē How to pronounce actinometry (audio) \ noun, plural actinometries

More from Merriam-Webster on actinometer

Britannica.com: Encyclopedia article about actinometer

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