retinal

adjective
ret·​i·​nal | \ ˈre-tə-nəl , ˈret-nəl\

Definition of retinal

 (Entry 1 of 2)

: of, relating to, involving, or being a retina

retinal

noun
ret·​i·​nal | \ ˈre-tə-ˌnal , -ˌnȯl\

Definition of retinal (Entry 2 of 2)

: a yellowish to orange aldehyde C20H28O derived from vitamin A that in combination with proteins forms the visual pigments of the retinal rods and cones

Examples of retinal in a Sentence

Recent Examples on the Web: Adjective

Due to coexisting ocular conditions (corneal or retinal), not all patents may be good candidates for these lenses. WSJ, "See What Cataract Surgery May Also Involve," 28 Nov. 2018 However, a retinal migraine usually only affects one eye while ocular migraines typically impact both. Korin Miller, SELF, "Ocular Migraines Shouldn’t Exist, But They Do, So Here’s What to Know," 7 June 2018 Such research is critical for scientists studying conditions like retinal degeneration, pregnancy loss, development disorders such as Down syndrome and early brain development. Thomas M. Burton, WSJ, "Trump Administration Cancels Research Contract for Fetal Tissue," 25 Sep. 2018 Eventually, prolonged bleeding from damaged retinal blood vessels can cause floating spots in a person’s vision, which may or may not clear up then reappear. Korin Miller, SELF, "This Is How Diabetes Can Affect Your Eyes," 8 Nov. 2018 Akka suggests using retinal scanning after passengers board the train en route to the airport. Jay Bennett, Popular Mechanics, "This Flying Train Is as Wild As It Sounds," 13 July 2018 In followup periods that lasted four to 12 months, the researchers watched as the implants' stem cells stayed put and successfully integrated with the patients' own retinal tissue. Melissa Healy, latimes.com, "This retinal implant may one day cure blindness caused by macular degeneration," 5 Apr. 2018 Before releasing it, Google had three retinal specialists furiously debate the early research results, Dean said. Mark Bergen, chicagotribune.com, "Google is training machines to predict when a patient will die," 25 June 2018 Before releasing it, Google had three retinal specialists furiously debate the early research results, Dean said. Mark Bergen, ajc, "Google is training machines to predict when a patient will die," 23 June 2018

Recent Examples on the Web: Noun

Using gentle microdermabrasion scrubs, retinals, and other exfoliation-boosting products can help prevent them, as does avoiding using heavy creams and makeup. Amanda Chan, Teen Vogue, "Milia: What They Are, and How to Remove Them," 8 Oct. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'retinal.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of retinal

Adjective

1798, in the meaning defined above

Noun

1944, in the meaning defined above

History and Etymology for retinal

Noun

retin- + -al entry 3

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Statistics for retinal

Last Updated

25 Jan 2019

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Time Traveler for retinal

The first known use of retinal was in 1798

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More Definitions for retinal

retinal

adjective
ret·​i·​nal | \ ˈret-ᵊn-əl, ˈret-nəl \

Medical Definition of retinal

 (Entry 1 of 2)

: of, relating to, involving, or being a retina a retinal examination retinal rods

retinal

noun
ret·​i·​nal | \ ˈret-ᵊn-ˌal , -ˌȯl \

Medical Definition of retinal (Entry 2 of 2)

: a yellowish to orange aldehyde C20H28O derived from vitamin A that in combination with proteins forms the visual pigments of the retinal rods and cones

called also retinene, retinene1, vitamin A aldehyde

More from Merriam-Webster on retinal

Rhyming Dictionary: Words that rhyme with retinal

Britannica.com: Encyclopedia article about retinal

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