Retinal
Part of speech: adjective
Definition: Of or pertaining to the retina.
Part of speech: noun
Definition: One of several yellow or red carotenoid pigments formed from rhodopsin by the action of light; retinene
Membrane
Part of speech: noun
Definition: A flexible enclosing or separating tissue forming a plane or film and separating two environments (usually in a plant or animal).A mechanical, thin, flat flexible part that can deform or vibrate when excited by an external force.A flexible or semi-flexible covering or waterproofing whose primary function is to exclude water.