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phototherapy

American  
[foh-tuh-ther-uh-pee] / ˌfoʊ təˈθɛr ə pi /

noun

  1. treatment of disease, especially of the skin, by means of light rays.

  2. light therapy.


phototherapy British  
/ ˌfəʊtəʊˈθɛrəpɪ, ˌfəʊtəʊˌθɛrəˈpjuːtɪks /

noun

  1. (functioning as singular) the use of light in the treatment of disease

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Derived Forms

Etymology

Origin of phototherapy

First recorded in 1895–1900; photo- + therapy

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A special home phototherapy device to treat psoriasis is as effective as going to a doctor’s office for the therapy, according to research funded by the Patient-Centered Outcomes Research Institute.

From The Wall Street Journal • Sep. 30, 2025

He further remarked, "It would be also used for wearable photonic biosensors and phototherapy systems in extreme environments."

From Science Daily • Mar. 6, 2024

If self-care doesn’t help, see a doctor, who might prescribe a biologic drug for inflammation, methotrexate to slow skin-cell growth, or phototherapy.

From Washington Post • Dec. 30, 2016

They are already testing a new suction machine, and are working on prototype incubators, examination lights, and vacuum delivery and phototherapy machines.

From BBC • Apr. 13, 2015

Newborns with hyperbilirubinemia are treated with phototherapy because UV light helps to break down the bilirubin quickly.

From Textbooks • Jun. 19, 2013

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