transcription, транскрипция: [ rō-ˈdäp-sən ]
noun
Etymology: International Scientific Vocabulary rhod- + Greek ops is sight, vision + International Scientific Vocabulary -in (I) — more at optic
Date: 1886
: a red photosensitive pigment in the retinal rods of the eye of most vertebrates that is important in vision in dim light — called also visual purple