iodopsin

noun

io·​dop·​sin ˌī-ə-ˈdäp-sən 

: a photosensitive violet pigment in the retinal cones that is similar to rhodopsin but more labile, is formed from vitamin A, and is important in daylight vision

Word History

Etymology

iod- (from Greek ioeidḗs "violet-colored") + -opsin (in rhodopsin) — more at iodine

First Known Use

1938, in the meaning defined above

Medical Definition

iodopsin

noun

io·​dop·​sin ˌī-ə-ˈdäp-sən 

: a photosensitive violet pigment in the retinal cones that is similar to rhodopsin but more labile, is formed from vitamin A, and is important in photopic vision