Definition of "retinal"

retinal¹

/ˈɹɛt.ɪn.əl/

adjective
not comparable
1. (ophthalmology, relational) Of or pertaining to the retina.

retinal²

/ˈɹɛt.əˌnæl/

noun
countable and uncountable, plural retinals
1. (biochemistry, organic chemistry) A yellow to orange aldehyde derived from vitamin A that is formed from rhodopsin by the action of light and in combination with proteins forms the visual pigments of the retinal rods and cones.