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
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The ever-popular HydraFacial uses non-invasive LED light therapy to brighten your skin; while the Southern Ceremony Citrus scrub sloughs dead skin cells with its namesake ingredient. Kate Donnelly, Forbes, 24 Feb. 2025 These days, Amazon can discover just about any intimate detail about an evil genius through algorithms gleaned from their searches for a shower caddy, light therapy lamp, and truffle salt. Scott Simon, NPR, 22 Feb. 2025 Using red and blue light therapy, it’s designed to deliver powerful, skin-soothing results—think boosting collagen and addressing acne—all from the comfort of home. Neha Tandon, Glamour, 17 Jan. 2025 Those with eye disorders, like macular degeneration or light sensitivity, should consult an ophthalmologist before using light therapy. Sandra Rose Salathe, Flow Space, 13 Dec. 2024 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 13 May. 2025.

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

Last Updated: - Updated example sentences
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