pho·​to·​ther·​a·​py ˌfō-tō-ˈther-ə-pē How to pronounce phototherapy (audio)

Examples of phototherapy in a Sentence

Recent Examples on the Web Light Therapy Light therapy, or phototherapy, is another way to get rid of hives. Karen Pallarito, Health, 24 Mar. 2024 One study even found that phototherapy can be beneficial when paired with antihistamines in chronic hive cases. Karen Pallarito, Health, 24 Mar. 2024 Light therapy, also known as phototherapy, is a skin treatment that harnesses the power of ultraviolet (UV) light to treat several skin conditions, which includes severe eczema. Karen Pallarito, Health, 18 Dec. 2023 Side Effects of Light Therapy Some of the possible side effects of phototherapy include: Sunburn and skin tenderness: Some people will experience mild redness within 24 hours of treatment. Karen Pallarito, Health, 18 Dec. 2023 Light Therapy Light therapy, or phototherapy, exposes your skin to ultraviolet (UV) light to alleviate itching or inflammation. Anthea Levi, Health, 14 Nov. 2023 The dialing down of inflammation has more benefits than simply reducing redness: When used on certain areas of the body, phototherapy (aka light therapy) may help to reduce pain and soreness and even heal deeper tissues. Calin Van Paris, Vogue, 24 Nov. 2023 Light therapy, also known as bright light therapy or phototherapy, uses specific wavelengths of light to mimic natural light and send signals to your brain’s emotional center to produce serotonin. Caitlin Pagán, Verywell Health, 3 Oct. 2023 While other home phototherapy devices exist, the bili-hut boasts a short treatment time of 12 hours, compared with competing devices that can take up to six days, Brezinski said. Globe Staff,, 27 Feb. 2023

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

Word History

First Known Use

1899, in the meaning defined above

Time Traveler
The first known use of phototherapy was in 1899

Dictionary Entries Near phototherapy

Cite this Entry

“Phototherapy.” Dictionary, Merriam-Webster, Accessed 25 May. 2024.

Medical Definition


pho·​to·​ther·​a·​py -ˈther-ə-pē How to pronounce phototherapy (audio)
plural phototherapies
: the application of light for therapeutic purposes

More from Merriam-Webster on phototherapy

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!