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.
Origin of retina
1350–1400; Middle English
ret(h)ina < Medieval Latin
rētina, perhaps equivalent to Latin
rēt- (stem of
rēte) net +
-ina
-ine1
Words nearby retina
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
Example sentences from the Web for retina
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
Medical definitions for retina
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.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.