Real Dictionary

retina
a small simple room, as in a prison, convent, or monastery; cubicle [...]
a specialized cell that conducts nerve impulses: consists of a cell body, axon, and dendrites [...]
a substance occurring in plant or animal tissue and producing a characteristic colour, such as chlorophyll in green plants and haemoglobin in red blood [...]
a thickness of some homogeneous substance, such as a stratum or a coating on a surface [...]
an animal tissue consisting of one or more layers of closely packed cells covering the external and internal surfaces of the body. The cells vary in structure according to their function, which may be protective, secretory, or absorptive [...]
an encapsulated collection of nerve-cell bodies, usually located outside the brain and spinal cord [...]
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
the natural action or intended purpose of a person or thing in a specific role [...]
the process of degenerating [...]
countable noun: Your retina is the area at the back of your eye. It receives the image that you see and then sends the image to your brain.