binocular

American  

[buh-nok-yuh-ler, bahy-] / bəˈnɒk jə lər, baɪ- /

noun

1. Also called pair of binoculars,.  Also called prism binoculars.  Usually 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.

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adjective

1. involving both eyes.

   binocular vision.

binocular British  

/ baɪ-, bɪˈnɒkjʊlə /

adjective

1. involving, relating to, seeing with or intended for both eyes

   binocular vision

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binocular Scientific  

/ bə-nŏk′yə-lər /

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

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1. 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.

Other Word Forms

• binocularity
  noun
• binocularly
  adverb

Etymology

Origin of binocular

First recorded in 1705–15; bin- + ocular

Example Sentences

See Examples For:

binocular

The obvious question hangs over the business model: Why would anyone pay to look through a binocular viewer when they already carry an iPhone capable of zooming, recording video and applying digital filters?

From The Wall Street Journal ● Jun. 14, 2026

Many cruise lines offer educational seminars to prepare you for each port, binocular training to help you spot wildlife, and excursions ranging from fishing and hiking to food tours and animal encounters.

From Salon ● Jul. 20, 2025

Ms. Rosenberg is easily identifiable thanks to a binocular contraption she straps around her head, which is attached to bifocal lenses that allow her to quickly turn between the judge’s magnified expression and her sketches.

From New York Times ● Dec. 12, 2023

A popular one involves binocular rivalry: if different images are shown to a person’s left and right eye, their conscious perception flips between them.

From Science Magazine ● Jun. 25, 2023

There may be some convergent evolution because there may be only one best solution to a certain environmental problem— something like two eyes, for example, for binocular vision at optical frequencies.

From "Cosmos" by Carl Sagan