photopathy

[foh-top-uh-thee]

noun

1. movement of an organism in response to the intensity of light, especially away from the source of light.

2. any condition or disease produced by the effect of light, especially in excessive amounts.

Other Word Forms

• photopathic adjective

Word History and Origins

Origin of photopathy¹

First recorded in 1895–1900; photo- + -pathy