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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. 2015.
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Examples from the Web for monocular
Historical Examples
  • The double interpretation is more readily accomplished by monocular than by binocular vision.

    Visual Illusions Matthew Luckiesh
  • Nystagmus occasionally occurs in monocular fixation (with exclusion of the other eye).

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

    Winds Of Doctrine George Santayana
  • 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
  • The little microscope was an excellent one, though only a monocular.

    Badge of Infamy Lester del Rey
  • Images on the computer screen are held together by the conventions of monocular vision.

  • These are the retinal field of vision, the monocular field, and the binocular field.

    Visual Illusions Matthew Luckiesh
  • 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
  • The dependence of one monocular field upon the other, and also their independence, are emphasized by this experiment.

    Visual Illusions Matthew Luckiesh
  • In monocular vision, on the contrary, the movement is uniformly upward and involves a progressive increase in error.

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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