- 1. An abnormally heightened reactivity of the skin to sunlight. 2. Responding to light, e.g., as by a photocell. [photo + L. sensus, a feeling, fr. sentio, to feel]
* * *1) sensitive or sensitized to the action of radiant energy <\photosensitive paper>2) being or caused by an abnormal reaction to sunlight <\photosensitive rashes>
* * *pho·to·sen·si·tive (fo″to-senґsĭ-tiv) 1. reacting to light; said of a cell, organ, or organism. 2. having abnormally heightened reactivity of skin or eyes to sunlight.
Medical dictionary. 2011.