[buh-nok-yuh-ler, bahy-]
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.
involving both eyes: binocular vision.

1705–15; bin- + ocular

binocularity, noun
binocularly, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
binocular (bɪˈnɒkjʊlə, baɪ-)
involving, relating to, seeing with or intended for both eyes: binocular vision
[C18: from bi-1 + Latin oculus eye]

binoculars (bɪˈnɒkjʊləz, baɪ-)
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

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).

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-)
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 

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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.
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Example sentences
They hover in optimistic vigil, cameras and binoculars poised.
But controllers can safely monitor flights with ground radar systems and
  binoculars, he says.
To his chagrin, the binoculars made no difference whatsoever.
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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