actinometer

noun

ac·​ti·​nom·​e·​ter ˌak-tə-ˈnä-mə-tər How to pronounce actinometer (audio)
: 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
actinometric adjective
actinometry noun

Examples of actinometer in a Sentence

Recent Examples on the Web More advanced systems can have all that, plus all or a selection of these: a rain gauge, an anemometer for measuring wind speed and direction, a barometer, and an actinometer for checking UV index and solar radiation. Adrienne Donica, Popular Mechanics, 4 Jan. 2021

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'actinometer.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

actino- + -meter

First Known Use

1833, in the meaning defined above

Time Traveler
The first known use of actinometer was in 1833

Dictionary Entries Near actinometer

Cite this Entry

“Actinometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/actinometer. Accessed 28 Mar. 2024.

Medical Definition

actinometer

noun
ac·​ti·​nom·​e·​ter ˌak-tə-ˈnäm-ət-ər How to pronounce actinometer (audio)
: 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
actinometric adjective
actinometry noun
plural actinometries

More from Merriam-Webster on actinometer

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