retina
(noun) the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve
Source: WordNet® 3.1
retina (plural retinas or retinae or retinæ)
(anatomy) The thin layer of cells at the back of the eyeball where light is converted into neural signals sent to the brain.
• atrine, ratiné, retain, tanier, tearin', tin ear
Source: Wiktionary
Ret"i*na, n. Etym: [NL., from L. rete a net. Cf. Reticule.] (Anat.)
Definition: 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.
Note: The fibers of the optic nerve and the retinal blood vessels spread out upon the front surface of the retina, while the sensory layer (called Jacob's membrane), containing the rods and cones, is on the back side, next the choroid coat.
Source: Webster’s Unabridged Dictionary 1913 Edition
23 November 2024
(adjective) concerned primarily with theories or hypotheses rather than practical considerations; “theoretical science”
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