Pronunciation: (ret'n-ul), [key]
of or pertaining to the retina of the eye.
Pronunciation: (ret'n-al", -ôl"), [key]
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. Also,ret•i•nenePronunciation: (ret'n-ēn"). [key]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.