Definition of "photosensitive" [photosensitive]

• Sensitive or responsive to light or other radiant energy. (adjective)
• Medicine Abnormally sensitive or reactive to light. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The concern is that about 1 in 4,000 people have something known as photosensitive epilepsy."
• "Most SLE patients are photosensitive, that is, they are sensitive to the sun and other forms of light."
• "About 40 to 60 percent of all SLE patients are photosensitive, that is, UV light from the sun and other sources actually worsens their symptoms."