retina
[ ret-n-uh, ret-nuh ]
/ ˈrɛt n ə, ˈrɛt nə /
noun, plural ret·i·nas, ret·i·nae [ret-n-ee]. /ˈrɛt nˌi/. Anatomy.
the innermost coat of the posterior part of the eyeball that receives the image produced by the lens, is continuous with the optic nerve, and consists of several layers, one of which contains the rods and cones that are sensitive to light.
Trademark, Computers.
Retina, a brand name used by Apple, Inc., to describe display screens having a resolution so high that it is difficult to see individual pixels with the human eye: a Retina display; Retina technology; Retina quality.
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Origin of retina
1350–1400; Middle English ret(h)ina<Medieval Latin rētina, perhaps equivalent to Latin rēt- (stem of rēte) net + -ina-ine1
Definition for retina (2 of 2)
Retin-A
[ ret-n-ey ]
/ ˌrɛt nˈeɪ /
Pharmacology, Trademark.
a brand of tretinoin, used especially to reduce wrinkles caused by overexposure to the sun.
Origin of Retin-A
First recorded in 1975–80
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
British Dictionary definitions for retina
retina
/ (ˈrɛtɪnə) /
noun plural -nas or -nae (-ˌniː)
the light-sensitive membrane forming the inner lining of the posterior wall of the eyeball, composed largely of a specialized terminal expansion of the optic nerve. Images focused here by the lens of the eye are transmitted to the brain as nerve impulses
Derived forms of retina
retinal, adjectiveWord Origin for retina
C14: from Medieval Latin, perhaps from Latin rēte net
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for retina (1 of 2)
retina
[ rĕt′n-ə ]
n. pl. ret•i•nas
The delicate multilayered light-sensitive membrane lining the inner posterior chamber of the eyeball containing the rods and cones and connected by the optic nerve to the brain.
Other words from retina
ret′i•nal adj.Medical definitions for retina (2 of 2)
Retin-A
[ rĕt′n-ā′ ]
A trademark for a preparation of retinoic acid.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for retina
retina
[ rĕt′n-ə ]
Plural retinas retinae (rĕt′n-ē′)
The light-sensitive membrane that lines the inside of the back of the eyeball and connects to the brain by the optic nerve. The retina of vertebrate animals contains rods and cones, specialized cells that absorb light.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Cultural definitions for retina
retina
[ (ret-n-uh) ]
The inner layer of the eye, sensitive to light, that is connected to the brain by the optic nerve. The retina lines the rear of the eye-ball. The lens of the eye focuses waves of light on the retina.
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.