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optical character reader
optical character recognition
optical computer
optical disk
optical double star
optical fiber
optical glass
optical illusion
optical isomerism
optical mouse
optical rotation
optical scanner
optical semiconductor
optical sound
optical tweezers
optician
optics
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optic cup
op·tic cup (plural op·tic cups)


noun 
Definition:
 
embryonic depression that becomes retina: a two-walled depression in a human embryo that develops into the retina
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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