noun Biochemistry.
- an orange pigment, C20H28O, that is the active component of rhodopsin and is liberated upon the absorption of light in the vision cycle; vitamin A aldehyde.
noun
- the aldehyde form of the polyene retinol (vitamin A) that associates with the protein opsin to form the visual purple pigment rhodopsin
n.
- Either of two yellow to red retinal pigments, formed by oxidation of vitamin A alcohols.
n.
- retinaldehyde