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

reticulum cell sarcoma, retiform, retiform tissue, retin-, retin-a, retina, retinaculum, retinaculum of fibular muscles, retinaculum of flexor muscles, retinaculum of peroneal muscles, retinaculum of skin

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, adjective

Word 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.

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.