Retinal /(?)/

Ret·i·nal

Retinal

a.
  1. Of or pertaining to the retina. (Anat.)

Phrases & Compounds
Retinal purple
the visual purple.

Retinal

n.
  1. 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. (Chem.)