retina

noun
ret·​i·​na | \ ˈre-tə-nə How to pronounce retina (audio) , ˈret-nə\
plural retinas also retinae\ ˈre-​tə-​ˌnē How to pronounce retinae (audio) , -​ˌnī \

Definition of retina

: the sensory membrane that lines the eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve — see eye illustration

Examples of retina in a Sentence

Recent Examples on the Web

Guests also cheered for the information that Apple has sold 400 million iPads, and that the new iPad Pro has a liquid retina display and a USB-C port. Kaitlyn Tiffany, Vox, "Silicon Valley brings its “humanist,” “minimalist” aesthetic to Brooklyn.," 31 Oct. 2018 Medical offices would also need to purchase a specific retina camera, which could increase the cost; IDx has an agreement with the camera manufacturer to distribute the two products bundled. Ike Swetlitz, STAT, "FDA approves first AI software that can identify disease, no specialists needed," 11 Apr. 2018 Then went the retina in her right eye, according to a lawsuit Tyler and her husband filed in March against the clinic. Laurie Mcginley, Washington Post, "Miracle cures or modern quackery? Stem cell clinics multiply, with heartbreaking results for some patients.," 29 Apr. 2018 The mice proved able to see infrared even in daylight conditions, with regular light also crowding their retinas. David Grossman, Popular Mechanics, "Nanoinjections Let Mice See Infrared Light," 4 Mar. 2019 Diabetic Macular Edema Chronically high blood sugar levels from diabetes can damage the blood vessels in your retina. Juno Demelo, Glamour, "4 Times Vision Loss Is About More Than Your Eyes Getting Older," 13 Nov. 2018 These exams include a number of procedures to assess both your eyesight and ocular health, including pupil dilation to see the optic nerve and retina and a thorough look at the front of your eye to look for things like cataracts or cornea scratches. Carolyn L. Todd, SELF, "Exactly How Often You Really Need to See Different Kinds of Doctors," 17 Jan. 2019 In April 2001, when reporting on the Sri Lankan civil war, Marie lost her left eye after a grenade landed near her and shrapnel pierced her retina. Janine Di Giovanni, Town & Country, "Hollywood Chameleon Rosamund Pike Tackles the Life Story of War Correspondent Marie Colvin," 15 Nov. 2018 The two-stage AI system takes a more human-like approach to analyzing patients' optical coherence tomography (OCT) scans of their retinas. Christopher Carbone, Fox News, "AI tool 'as good as experts' at detecting eye problems, scientists say," 14 Aug. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'retina.' 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 retina

14th century, in the meaning defined above

History and Etymology for retina

Middle English rethina, from Medieval Latin retina, probably from Latin rete net

Keep scrolling for more

Learn More about retina

Dictionary Entries near retina

retimber

retime

retin-

retina

retinaculate

retinaculum

retinal

Statistics for retina

Last Updated

1 May 2019

Look-up Popularity

Time Traveler for retina

The first known use of retina was in the 14th century

See more words from the same century

Keep scrolling for more

More Definitions for retina

retina

noun

English Language Learners Definition of retina

: the sensitive tissue at the back of the eye that receives images and sends signals to the brain about what is seen

retina

noun
ret·​i·​na | \ ˈre-tə-nə How to pronounce retina (audio) \
plural retinas also retinae\ -​ˌnē \

Kids Definition of retina

: the membrane that lines the back part of the eyeball, contains the rods and cones, and converts the images received by the lens into signals that are transmitted to the brain

retina

noun
ret·​i·​na | \ ˈret-ᵊn-ə, ˈret-nə How to pronounce retina (audio) \
plural retinas also retinae\ -​ᵊn-​ˌē How to pronounce retinae (audio) \

Medical Definition of retina

 (Entry 1 of 2)

: the sensory membrane that lines most of the large posterior chamber of the vertebrate eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve

Retin-A

trademark
Ret·​in-A | \ ˌret-ᵊn-ˈā How to pronounce Retin-A (audio) \

Medical Definition of Retin-A (Entry 2 of 2)

used for a preparation of tretinoin

Keep scrolling for more

More from Merriam-Webster on retina

Spanish Central: Translation of retina

Nglish: Translation of retina for Spanish Speakers

Britannica English: Translation of retina for Arabic Speakers

Britannica.com: Encyclopedia article about retina

Comments on retina

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

WORD OF THE DAY

highly pertinent or appropriate

Get Word of the Day daily email!

Test Your Vocabulary

Time Traveler Quiz: Which Word Came First?

  • time traveler quiz which word came first
  • Which came first?
True or False

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

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

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!