eyepiece

noun

eye·​piece ˈī-ˌpēs 

: the lens or combination of lenses at the eye end of an optical instrument

Examples of eyepiece in a Sentence

Recent Examples on the Web

Ideal for exploring our own solar system, the Celestron PowerSeeker 80EQ comes with 20mm and 4mm eyepieces, a 3x Barlow lens, a German equatorial mount, finderscope and Starry Night astronomy software. — Chris McMullen, Space.com, 24 Aug. 2026

The first telescopes increased the size of this opening beyond that of the pupil, allowing far more light to pass through, and used lenses to focus that light onto an eyepiece. — Elijah Tan, Encyclopedia Britannica, 18 Aug. 2026

The final product looks something like a cross between a low-budget Cyberpunk eyepiece and the disposable 3D glasses used in early-2000s movie theaters. — Mack Degeurin, Popular Science, 6 Aug. 2026

Word History

First Known Use

1729, in the meaning defined above

Rhymes for eyepiece

• altarpiece
• centerpiece
• frontispiece
• mantelpiece
• masterpiece
• pilates
• specialise
• stabilise
• syntheses
• apiece
• aris
• assise

Kids Definition

eyepiece

noun

eye·​piece ˈī-ˌpēs 

: the lens or combination of lenses at the eye end of an optical instrument (as a microscope or telescope)

Medical Definition

eyepiece

noun

eye·​piece ˈī-ˌpēs 

: the lens or combination of lenses at the eye end of an optical instrument

called also ocular