retinal

adjective
ret·​i·​nal | \ ˈre-tə-nəl How to pronounce retinal (audio) , 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 How to pronounce retinal (audio) , -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 Developed by Spark Therapeutics, Luxturna uses an injection in the eyes to deliver a normal copy of the RPE65 gene directly to retinal cells. Amy Dockser Marcus, WSJ, "Gene Therapy Shows Promise for a Form of Blindness, but Is It a Cure?," 9 Dec. 2020 So, the researchers damaged the optic nerve, then activated the three stem cell genes in the retinal ganglion cells. John Timmer, Ars Technica, "Two very different approaches to restoring vision," 6 Dec. 2020 The team focused specifically on neurons at the back of the eye called retinal ganglion cells. Kelly Servick, Science | AAAS, "Researchers restore lost sight in mice, offering clues to reversing aging," 2 Dec. 2020 Then in middle school, a genetic condition caused a retinal detachment that left him blind in his left eye. Amanda Morris, The Arizona Republic, "A Chandler student designed a tougher football helmet and won a national prize for it," 2 Dec. 2020 In 60 years, Starbucks will be gone, and the space will be occupied by a shop that sells retinal implants that record your memories and play them back holographically. James Lileks, Star Tribune, "The neighborhood drugstore might be next to go," 29 Nov. 2020 Scientists can turn stem cells into immature cells of many different types – neurons, heart cells, retinal cells – but they get stuck in this fetal-like state. Karen Weintraub, USA TODAY, "California Prop 14 would keep taxpayer funding of stem cell therapy research, which can change lives: Meet the Langenhop kids," 2 Nov. 2020 Ten years ago, John Mitrofanis, a neuro-anatomist at the University of Sydney, was inspired to try light in Parkinson’s after a colleague told him that light in the NIR range protected retinal cells against toxins. Gunjan Sinha, Science | AAAS, "Trials begin for a new weapon against Parkinson’s: light," 17 Sep. 2020 While on their way to the hospital to interview the family, detectives learned the baby also had a retinal hemorrhage. Christine Dempsey, courant.com, "A baby girl suffered head trauma last month. Now, a Norwich man is under arrest, police say," 11 Sep. 2020 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.

See More

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

Keep scrolling for more

Learn More about retinal

Time Traveler for retinal

Time Traveler

The first known use of retinal was in 1798

See more words from the same year

Statistics for retinal

Last Updated

24 Dec 2020

Cite this Entry

“Retinal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/retinal. Accessed 21 Jan. 2021.

Keep scrolling for more

More Definitions for retinal

retinal

adjective
ret·​i·​nal | \ ˈret-ᵊn-əl, ˈret-nəl How to pronounce retinal (audio) \

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 How to pronounce retinal (audio) , -ˌȯl How to pronounce retinal (audio) \

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

Britannica.com: Encyclopedia article about retinal

Comments on retinal

What made you want to look up retinal? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Slippery Words Quiz—Changing with the Times

  • ducreux self portrait yawning
  • What is an earlier meaning of nice?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!