Webster's English Dictionary

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retina

ret.i.na \'ret-*n-*, 'ret-n*\ \-*n-.e-, -.i-\ \'ret-*n-*l, 'ret-n*l\ n or 
   retinas or ret.i.nae [ME rethina, fr. ML retina, prob. fr. L rete net; akin 
   to Gk] pl ere-mos lonely, solitary, Lith re.tis sieve : the sensory 
   membrane of the eye that receives the image formed by the le ns, is the 
   immediate instrument of vision, and is connected with the brain by the 
   optic nerve - ret.i.nal aj