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See retinal2.


(ˈrɛtɪˌniːn) or


(Biochemistry) the aldehyde form of the polyene retinol (vitamin A) that associates with the protein opsin to form the visual purple pigment rhodopsin
[C20: from retina + -ene]


(ˈrɛt n əl)

of or pertaining to the retina of the eye.


(ˈrɛt nˌæl, -ˌɔl)

an orange visual pigment, C20H28O, the active component of rhodopsin and iodopsin, that is liberated upon the absorption of light in the vision cycle.
[1940–45; retin (a) + -al3]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.retinene - either of two yellow to red retinal pigments formed from rhodopsin by the action of light
pigment - dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.)
retinal purple, rhodopsin, visual purple - a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light
References in periodicals archive ?
RPE65 contains 14 coding exons and encodes a protein of 65,000 expressing specifically and abundantly in the retinal pigment epithelium (RPE), which is involved in the production of 11-cis retinal and visual pigment regeneration.
For example, ciliary opsins generally favor 11-cis retinal, whereas retinochromes prefer all-trans retinal.
14) In the normal functioning retina vitamin A is transported from Bruch's membrane to reach the retinal pigment epithelium (RPE) where it is converted to 11-cis retinal and combines with the protein opsin which ultimately forms rhodopsin in the photoreceptor outer segments (see Figure 4, page 70).