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[muh-nok-yuh-ler] /məˈnɒk yə lər/
having only one eye.
of, relating to, or for the use of only one eye:
a monocular microscope.
a monocular instrument or device.
Origin of monocular
1630-40; < Late Latin monocul(us) one-eyed (see monocle) + -ar1
Related forms
monocularly, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for monocular
Historical Examples
  • The little microscope was an excellent one, though only a monocular.

    Badge of Infamy Lester del Rey
  • Nystagmus occasionally occurs in monocular fixation (with exclusion of the other eye).

    Schweigger on Squint C. Schweigger
  • These are the retinal field of vision, the monocular field, and the binocular field.

    Visual Illusions Matthew Luckiesh
  • Even the doctor, himself a hardened man of the sea, showed a brilliant spark of emotion behind his monocular attic window.

    Plum Pudding

    Christopher Morley
  • monocular, mon-ok′ū-lar, adj. with one eye only: fitted only for one eye at a time.

  • Images on the computer screen are held together by the conventions of monocular vision.

  • Others have been rendered single-seeing through obsessional use of the monocular lens, given over to proof of the presupposition.

    Criminal Types V. M. Masten
  • In monocular vision, on the contrary, the movement is uniformly upward and involves a progressive increase in error.

  • Several points of comparison between judgments made with binocular and with monocular vision remain to be stated.

  • It is a monocular philosophy, seeing outlines clear, but missing the solid bulk and perspective of things.

    Winds Of Doctrine George Santayana
British Dictionary definitions for monocular


having to do with or using only one eye
a device for use with one eye, such as a field glass
Derived Forms
monocularly, adverb
Word Origin
C17: from Late Latin monoculus one-eyed
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 monocular

1630s, from Late Latin monoculus "one-eyed," from Greek monos "alone, single" (see mono-) + Latin oculus "eye" (see eye (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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monocular in Medicine

monocular mo·noc·u·lar (mŏ-nŏk'yə-lər, mə-)

  1. Having or affecting one eye only.

  2. Having a single eyepiece, as certain microscopes or other optical instruments.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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