from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A delicate, multilayered, light-sensitive membrane lining the inner eyeball and connected by the optic nerve to the brain.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The thin layer of cells at the back of the eyeball where light is converted into neural signals sent to the brain.
from the GNU version of the Collaborative International Dictionary of English
- n. The delicate membrane by which the back part of the globe of the eye is lined, and in which the fibers of the optic nerve terminate. See eye.
from The Century Dictionary and Cyclopedia
- n. The innermost and chiefly nervous coat of the posterior part of the eyeball, between the choroid coat and the vitreous humor.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve
Middle English, from Medieval Latin rētina, from Latin rēte, net.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Medieval Latin retina, the diminutive form of Latin rete ("net"), probably from the Vulgar Latin phrase (tunica) *retina, literally "net-like tunic", used to describe the blood vessel system at the back of the eye. (Gerard of Cremona may have created this phrase as a translation for Arabic (tabaqa) sabakiva "net-like layer", which translates Ancient Greek ἀμφιβληστροειδής (χιτών)). (Wiktionary)