retina retin • retinacular · · · Info · Definitions · Characters · · retina · · Text Latin · · Script 6 · · Length Definitions · · · (noun) the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve. · · Noun Definition 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074