bin·oc·u·lar

[buh-nok-yuh-ler, bahy-]
noun
1.
Usually, binoculars. Also called pair of binoculars, prism binoculars. an optical device, providing good depth effect, for use with both eyes, consisting of two small telescopes fitted together side by side, each telescope having two prisms between the eyepiece and objective for erecting the image.
adjective
2.
involving both eyes: binocular vision.

Origin:
1705–15; bin- + ocular

bin·oc·u·lar·i·ty, noun
bin·oc·u·lar·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
binocular (bɪˈnɒkjʊlə, baɪ-) [Click for IPA pronunciation guide]
 
adj
involving, relating to, seeing with or intended for both eyes: binocular vision
 
[C18: from bi-1 + Latin oculus eye]

00:10
Binoculars is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
binoculars (bɪˈnɒkjʊləz, baɪ-) [Click for IPA pronunciation guide]
 
pl n
Also called: field glasses an optical instrument for use with both eyes, consisting of two small telescopes joined together

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

binocular
1738, "involving both eyes," from Fr. binoculaire, from L. bini "two by two, twofold, two apiece" (especially of matching things) + ocularis "of the eye," from oculus "eye" (see eye). The double-tubed telescopic instrument (1871, short for binocular glass) earlier was called a binocle (1690s).

binoculars
1877; see binocular. Earlier binocle (1690s).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

binocular bin·oc·u·lar (bə-nŏk'yə-lər, bī-)
adj.
Adapted to the use of both eyes. Used of an optical instrument.

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
binocular   (bə-nŏk'yə-lər)  Pronunciation Key 


(click for larger image in new window)

Adjective   Relating to or involving both eyes at once, as in binocular vision.

Noun   An optical device, such as a pair of field glasses, consisting of two small telescopes, designed for use by both eyes at once. Often used in the plural as binoculars.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Example sentences
Instead use binoculars, spotting scopes and cameras with telephoto lenses to
  enjoy wildlife.
With binoculars, you can see that happening as well.
Bring binoculars, field guides, and wear appropriate field clothes for a short
  field exercise following indoor instruction.
Zoom in on some tiny dots on the cliff, and a group of people with binoculars
  and telephoto lenses can be seen.
Images for binoculars
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