noun Biochemistry.
- a bright-red photosensitive pigment found in the rod-shaped cells of the retina of certain fishes and most higher vertebrates: it is broken down by the action of dim light into retinal and opsin.
noun
- a red pigment in the rods of the retina in vertebrates. It is dissociated by light into retinene, the light energy being converted into nerve signals, and is re-formed in the darkAlso called: visual purple See also iodopsin
n.
- A thermolabile protein that is sensitive to red light and is found in the external segments of the rods of the retina of the eye.visual purple