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

In each of the viewing areas exposed to the sky, a half-dozen large white telescopes had been set up beforehand, complete with stepladders to reach eyepieces already zeroed in on a planet or galaxy. —Jeff Spry, Space.com, 11 Jan. 2026

Beneath the dome, the 57-foot-long Great Refractor telescope is wrapped in black plastic tarps from eyepiece to lens assembly. —Ethan Baron, Mercury News, 31 Dec. 2025

The eyepieces have large (21 mm) eye lenses and they're deeply recessed in the eye cups, which allows for nearly a full field of view even when wearing glasses. —Scott Gilbertson, Wired News, 1 Dec. 2025

As before, budding stargazers don't get closer to galaxies and nebulae through an eyepiece, that sort of thing is handled by the smart part of this equation. —New Atlas, 21 Nov. 2025

Word History

First Known Use

1729, in the meaning defined above

Rhymes for eyepiece

• altarpiece
• centerpiece
• frontispiece
• mantelpiece
• masterpiece
• pilates
• summarise
• syntheses
• apiece
• aris
• assise
• caprice

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