of or pertaining to the eye or sight.
the eye.
a lens of an optical instrument.

1535–45; < Medieval Latin opticus < Greek optikós, equivalent to opt(ós) seen (verbid of ópsesthai to see) + -ikos -ic

interoptic, adjective
nonoptic, adjective
postoptic, adjective
preoptic, adjective
suboptic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
optic (ˈɒptɪk)
1.  of or relating to the eye or vision
2.  a less common word for optical
3.  an informal word for eye
[C16: from Medieval Latin opticus, from Greek optikos, from optos visible, seen; related to ōps eye]

Optic (ˈɒptɪk)
(Brit) trademark a device attached to an inverted bottle for dispensing measured quantities of liquid, such as whisky, gin, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1540s, from M.Fr. optique, obtique (c.1300), from M.L. opticus "of sight or seeing," from Gk. optikos "of or having to do with sight," from optos "seen, visible," from op-, root of opsesthai "be going to see," related to ops "eye," from PIE *oqw- "eye/see" (see eye). Optics
"science of sight and light" is from 1570s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

optic op·tic (ŏp'tĭk) or op·ti·cal (ŏp'tĭ-kəl)

  1. Of or relating to the eye or vision.

  2. Of or relating to the science of optics or optical equipment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
optic   (ŏp'tĭk)  Pronunciation Key 
Relating to or involving the eye or vision.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Although their eyes and optic nerves were functional, the region of their
  brains involved in visual processing had been damaged.
The bullet severed the optic nerve in his right eye before shattering his jaw
  and then lodging in his neck near his jugular vein.
In a good many cases, less than one ounce of this alcohol has caused atrophy of
  the optic nerve.
But the fly has evolved optic nerves hardwired directly to its wings, so it can
  still reverse direction before hitting the web.
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