: a branch of science that deals with measurement of the intensity of light
also : the practice of using a photometer

Examples of photometry in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The researchers used fiber photometry systems to detect neurotransmitters, which involved injecting the mice with fluorescent sensors. Elana Spivack, Popular Science, 19 Mar. 2025 The team pulled it off by using a technique called flow fiber photometry which works by imaging fluids tagged with fluorescent markers using a probe implanted in the brain. Ars Technica, 20 Jan. 2025

Word History

Etymology

New Latin photometria, from phot- + -metria -metry

First Known Use

1807, in the meaning defined above

Time Traveler
The first known use of photometry was in 1807

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Cite this Entry

“Photometry.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/photometry. Accessed 25 Mar. 2025.

Medical Definition

photometry

noun
plural photometries
: a branch of science that deals with measurement of the intensity of light
also : the practice of using a photometer

More from Merriam-Webster on photometry

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