Definition of "retinaldehyde" []

• Retinal (noun)

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• "That system starts with an unpredictable and information-lossy molecular conformational change (of a retinaldehyde molecule absorbing a photon of the right frequency) which then follows one of two processes."
• "Vitamin A is found as retinoic acid (Retin-A), retinol (retinaldehyde), or retinyl propionate."
• "Nevertheless in that period, after dissecting retinas from 300 frogs, he found that rhodopsin on stimulation with light yielded both the protein opsin and a compound he called "retinene" (now "retinaldehyde") that in turn yielded vitamin A (now called retinol)."