photoptarmosis pho·to·ptar·mo·sis (fō’tō-tär-mō’sĭs)
Reflex sneezing in response to bright light striking the retina.
photoradiation pho·to·ra·di·a·tion (fō’tō-rā’dē-ā’shən) n. A treatment for cancer in which an individual is injected with a photosensitizing agent and the cancerous tissue is exposed to visible light, often by means of a fiberoptic probe. Also called photochemotherapy.
- Photoradiation therapy
photoradiation therapy n. Photoradiation.
[foh-toh-ree-ak-shuh n] /ˌfoʊ toʊ riˈæk ʃən/ noun, Chemistry. 1. a chemical that involves or requires light. photoreaction pho·to·re·ac·tion (fō’tō-rē-āk’shən) n. A photochemical reaction.
[foh-toh-ree-ak-tuh-vey-shuh n] /ˌfoʊ toʊ riˌæk təˈveɪ ʃən/ noun, Biochemistry. 1. a process that repairs DNA damaged by ultraviolet light using an enzyme that requires visible light. photoreactivation pho·to·re·ac·ti·va·tion (fō’tō-rē-āk’tə-vā’shən) n. The activation by light of something previously inactive or inactivated.