op·ti·cal

[op-ti-kuhl]
adjective
1.
of, pertaining to, or applying optics or the principles of optics.
2.
constructed to assist sight or to correct defects in vision.
3.
of or pertaining to sight or vision; visual.
4.
of or pertaining to the eye.
5.
of or pertaining to an optician or opticians or to their products, especially eyeglasses: an optical service.
6.
dealing with or skilled in optics.
noun
7.
opticals, optical effects.
00:10
Optical is always a great word to know.
So is quincunx. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

Origin:
1560–70; optic + -al1

op·ti·cal·ly, adverb
non·op·ti·cal, adjective
non·op·ti·cal·ly, adverb
sub·op·ti·cal, adjective
sub·op·ti·cal·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
optical (ˈɒptɪkəl) [Click for IPA pronunciation guide]
 
adj
1.  of, relating to, producing, or involving light
2.  of or relating to the eye or to the sense of sight; optic
3.  (esp of a lens) aiding vision or correcting a visual disorder
 
'optically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

optical
1560s, from optic.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
optical   (ŏp'tĭ-kəl)  Pronunciation Key 
  1. Relating to vision or the eyes.

  2. Relating to optics.

  3. Relating to or using visible light.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Example sentences
Next-gen optical camouflage is busting out of defense labs and into the street.
The less time a camera's optical eye is open, the less time a subject has to
  move.
It was a tough ask for modern optical-character-recognition software, too,
  which had to be trained to accommodate it.
The optical lasers, each with a slightly different frequency, imparted momentum
  to the atoms.
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