light therapy

noun

: the treatment of medical or psychiatric conditions (such as seasonal affective disorder) by the controlled application of light

called also light treatment, phototherapy

Examples of light therapy 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.
Using a light therapy lamp, like those marketed for seasonal affective disorder, may help put some spring in your step. Jamie Ducharme, Health, 5 Mar. 2026 This is known as low level light therapy. Rebecca Strong, USA Today, 16 Feb. 2026 What are the best light therapy lamps to buy? Bestreviews, Chicago Tribune, 16 Jan. 2026 Shop other affordable light therapy tools on Amazon, below. Lauren Pardee, InStyle, 29 Dec. 2025 See All Example Sentences for light therapy

Word History

First Known Use

1987, in the meaning defined above

Time Traveler
The first known use of light therapy was in 1987

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Cite this Entry

“Light therapy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/light%20therapy. Accessed 9 Mar. 2026.

Medical Definition

light therapy

noun
: phototherapy
especially : the use of strong light (as of 10,000 lux intensity) for the treatment of depression and gloom (as in seasonal affective disorder)

called also light treatment

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