retinal 1
/ret"n euhl/ , adj.
of or pertaining to the retina of the eye.
[ 1830-40; RETIN(A) + -AL 1 ]
retinal 2
/ret"n al', -awl'/ , n. Biochem.
an orange pigment, C 20 H 28 O, that is the active component of rhodopsin and is liberated upon the absorption of light in the vision cycle; vitamin A aldehyde.
Also, retinene /ret"n een'/ .
[ 1940-45; RETIN(A) + -AL 3 ]