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[buh-nok-yuh-ler, bahy-] /bəˈnɒk yə lər, baɪ-/
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.
Origin of binocular
First recorded in 1705-15; bin- + ocular
Related forms
binocularity, noun
binocularly, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for binocular
Historical Examples
  • Archer's binocular hung at the south-west pillar of the porch, and another swung at the northward veranda of the old log hospital.

  • The Captain applied his binocular telescope to his eyes as he spoke.

    The Giant of the North R.M. Ballantyne
  • An ordinary opera-glass or binocular is a very useful instrument for looking at the stars in the heavens.

  • The painter cannot imitate focal perspective or binocular perspective.

    Visual Illusions Matthew Luckiesh
  • Nares went below, fetched up his binocular, and fell into a silent perusal of the sea-line: I also, with my unaided eyesight.

  • From this it is easy to trace the laws of binocular diplopia.

    Schweigger on Squint C. Schweigger
  • From his saddle Langdon unslung a binocular glass imported from Paris.

    The Grizzly King James Oliver Curwood
  • If no binocular fusion exists, then all possibility of diplopia is excluded.

    Schweigger on Squint C. Schweigger
  • Poole re-focussed the binocular, but it was some moments before he spoke.

    Fitz the Filibuster George Manville Fenn
  • Kirtley's binocular, strung over his shoulders, came in handy to the others.

    Villa Elsa Stuart Henry
British Dictionary definitions for binocular


/bɪˈnɒkjʊlə; baɪ-/
involving, relating to, seeing with or intended for both eyes: binocular vision
Word Origin
C18: from bi-1 + Latin oculus eye
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for binocular

1738, "involving both eyes," earlier "having two eyes" (1713), from French binoculaire, from Latin bini "two by two, twofold, two apiece" (see binary) + ocularis "of the eye," from oculus "eye" (see eye (n.)). The double-tubed telescopic instrument (1871, short for binocular glass) earlier was called a binocle. Related: Binocularity.

Online Etymology Dictionary, © 2010 Douglas Harper
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binocular in Medicine

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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binocular in Science

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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