/ Dictionary / Index P phototherapy: Meaning and Definition of Find definitions for: pho•to•ther•a•py Pronunciation: (fō"tu-ther'u-pē), [key] — n. treatment of disease, esp. of the skin, by means of light rays. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: phototherapy (Thesaurus) phototherapeutics photothermic Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language