sen·si·tize / ˈsensiˌtīz/ • v. [tr.] cause (someone or something) to respond to certain stimuli; make sensitive: the introductory section aims to sensitize students to the methodology of the course. ∎ make (photographic film) sensitive to light: the kit sensitizes any 35 mm film in hours. ∎ (often be sensitized to) make (an organism) abnormally sensitive to a foreign substance: the workers had been immunologically sensitized to the enzyme. DERIVATIVES: sen·si·ti·za·tion / ˌsensitiˈzāshən/ n. sen·si·tiz·er n.