Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Physics, Photographyphotosensitizepho‧to‧sen‧si‧tize (also photosensitise British English) /ˌfəʊtəʊˈsensətaɪz $ ˌfoʊtəˈsen-/ verb [transitive] HPTCPto make something photosensitive→ See Verb table ldoceonline.com