pho·to·sen·si·tiv·i·ty (fō
tō-sěn
sĭ-tĭv
ĭ-tē)
n. pl. pho·to·sen·si·tiv·i·ties ► Sensitivity or responsiveness to light.
► Medicine. An abnormally heightened response, especially of the skin, to sunlight or ultraviolet radiation, caused by certain disorders or chemicals and characterized by a toxic or allergic reaction.
[TahlilGaran] American Dictionary ▲