Dictionary

retina

retina

noun ret·i·na \ˈre-tə-nə, ˈret-nə\

: the sensitive tissue at the back of the eye that receives images and sends signals to the brain about what is seen

plural retinas or ret·i·nae \-ˌnē, -ˌnī\

Full Definition of RETINA

:  the sensory membrane that lines the eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve — see eye illustration

Origin of RETINA

Middle English rethina, from Medieval Latin retina, probably from Latin rete net
First Known Use: 14th century

retina

noun ret·i·na \ˈret-ən-ə, ˈret-nə\   (Medical Dictionary)
plural retinas also ret·i·nae \-ən-ˌē\

Medical Definition of RETINA

:  the sensory membrane that lines most of the large posterior chamber of the vertebrate eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve

Illustration of RETINA

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