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heliotherapy

American  
[hee-lee-oh-ther-uh-pee] / ˌhi li oʊˈθɛr ə pi /

noun

  1. treatment of disease by means of sunlight.

heliotherapy British  
/ ˌhiːlɪəʊˈθɛrəpɪ /

noun

  1. the therapeutic use of sunlight

"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

Etymology

Origin of heliotherapy

First recorded in 1885–90; helio- + therapy

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.