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

1895–1900; photo- + therapy

phototherapic [foh-toh-thuh-rap-ik] , adjective
phototherapist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phototherapy or phototherapeutics (ˌfəʊtəʊˈθɛrəpɪ, ˌfəʊtəʊˌθɛrəˈpjuːtɪks)
(functioning as singular) the use of light in the treatment of disease
phototherapeutics or phototherapeutics
photothera'peutic or phototherapeutics
photothera'peutically or phototherapeutics

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

phototherapy pho·to·ther·a·py (fō'tō-thěr'ə-pē)
The treatment of a disorder, especially of the skin, by exposure to light, including ultraviolet and infrared radiation. Also called light treatment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Phototherapy may be given alone or after you take a drug that makes the skin sensitive to light.
Phototherapy is a medical procedure in which your skin is carefully exposed to ultraviolet light.
Safety of phototherapy ultraviolet light causes progressive damage to human skin.
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