photochemotherapy

noun
pho·​to·​che·​mo·​ther·​a·​py | \-ˌkē-mō-ˈther-ə-pē \
plural photochemotherapies

Medical Definition of photochemotherapy 

: treatment especially for psoriasis in which administration of a photosensitizing drug (as psoralen) is followed by exposure to ultraviolet radiation or sunlight

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