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See retinal2.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The method entails applying on the skin a therapeutically effective amount of a cosmetic or dermatological composition that has retinaldehyde and glycylglycine oleamide and at least one cosmetically or dermatologically acceptable carrier.
A newborn lethal defect due to inactivation of retinaldehyde dehydrogenase type 3 is prevented by maternal retinoic acid treatment.
She says: "Vitamin A helps repair sun damage and induces collagen production, so use some form of vitamin A derivative in the evening - a retinol or retinaldehyde cream - as tolerated.
Isotretinoin, retinaldehyde and tazarotene are less studied than tretinoin, however their results are also promising.
Other forms of retinoid include retinyl palmitate and retinaldehyde, which can be found in skin care products.
Mutations in genes such as RP1L1 [8q23.1], RLBP1 (retinaldehyde binding protein 1) [15q26.1], CRB1 (crumbs family member 1) [1q31.3], ABCA4 (ATP-binding cassette subfamily A member 4) [1p22.1], RPE65 (retinal pigment epithelium-specific protein 65kDa) [1p31.2], and CNGB1 (cyclic nucleotide gated channel beta 1) [16q21] also share 1%, 1%, 6.5%, 2%, and 4%, respectively, in autosomal recessive inheritance.
Moreover, ALDH1, the dominant form in the family of ALDH involved in the conversion of retinaldehyde to retinoic acid, is a recognized marker [117].
Goverse et al., "Expression of retinaldehyde dehydrogenase enzymes in mucosal dendritic cells and gut-draining lymph node stromal cells is controlled by dietary vitamin a," The Journal of Immunology, vol.
Retinal, also named retinaldehyde, is a polyene chromophore and is the basis for animal vision allowing the conversion of light into metabolic energy.
* Proprietary and Patent Protected Ingredients (Client Exclusivity; ex: Stabilized Retinaldehyde)
Ray, "Cutting edge: inhaled antigen upregulates retinaldehyde dehydrogenase in lung [CD103.sup.+] but not plasmacytoid dendritic cells to induce Foxp3 de novo in [CD4.sup.+] T cells and promote airway tolerance," The Journal of Immunology, vol.
Retinol is transported from the liver to the target tissues as retinolbinding protein and is then enzymatically converted to retinaldehyde and consequently to retinoic acid [53, 55].