Retinal
Retinal , adjective
(Anatomy) Of or pertaining to the retina.
Collocations (1)
Retinal purple (Physiology Chemistry) , the visual purple.
Retinal , noun
(Chemistry) A retinoid compound (C20H28O), closely related to vitamin A, which is a component of the visual pigments in the eye. It is also called retinaldehyde and vitamin A aldehyde.