transcription, транскрипция: [ ˌī-ə-ˈdäp-sən ]
noun
Etymology: iod- (from Greek ioeidēs violet colored) + Greek ops is sight, vision + English -in — more at optic
Date: 1938
: 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