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 The impact of the projectile bullet had lacerated her eyebrow and detached her retina, as well as caused serious trauma to her eyeball. Popular Science, "How to protect yourself from rubber bullets—and why these ‘nonlethal’ weapons are so dangerous," 3 June 2020 Its retina display can be awoken with a simple lift of the wrist, and the aluminum construction is waterproof. Melissa Lee, USA TODAY, "The Apple Watch Series 3 is back down to its lowest price of all time—while it lasts," 30 June 2020 The fractures often penetrate and damage the eye nerves and the retina. Popular Science, "How to protect yourself from rubber bullets—and why these ‘nonlethal’ weapons are so dangerous," 3 June 2020 The center part of the retina is the most sensitive part, which is what causes vision loss. Ashton Nichols, Dallas News, "Bedford biomedical firm receives $2 million to begin macular degeneration trials," 3 June 2020 Constructing a curved retina is important because light only hits it after passing through a curved lens. Sophie Bushwick, Scientific American, "New Artificial Eye Mimics a Retina’s Natural Curve," 20 May 2020 In 1983, Margaret Thatcher had an eye operation for a detached retina at a private clinic in Windsor. Mark Landler, New York Times, "With Boris Johnson in Intensive Care, U.K. Faces a Leadership Quandary," 7 Apr. 2020 Guthrie suffered a torn retina in one of her eyes after her two-year-old son threw a toy truck at her. oregonlive, "Macy’s Thanksgiving Day Parade 2019: How to livestream, TV channel, when it starts," 28 Nov. 2019 Reduced blood flow to the visual periphery of the retina means vision loss occurs there first. NDEs can be either positive or negative experiences. Christof Koch, Scientific American, "What Near-Death Experiences Reveal about the Brain," 19 May 2020

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.

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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

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Time Traveler for retina

Time Traveler

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

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Statistics for retina

Last Updated

19 Jul 2020

Cite this Entry

“Retina.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/retina. Accessed 3 Aug. 2020.

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More Definitions for retina

retina

noun
How to pronounce retina (audio)

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

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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

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