eyepiece

[ ahy-pees ]

noun

1. the lens or combination of lenses in an optical instrument through which the eye views the image formed by the objective lens or lenses; ocular.

eyepiece

/ ˈaɪˌpiːs /

noun

1. the lens or combination of lenses in an optical instrument nearest the eye of the observer

eyepiece

/ ī′pēs′ /

1. The lens or group of lenses closest to the eye in an optical instrument such as a telescope or microscope.

Word History and Origins

Origin of eyepiece¹

First recorded in 1780–90; eye + piece

Example Sentences

I wear it forward when the lights are too bright but otherwise backward because it helps keep my eyepiece in place.

From Los Angeles Times

Her children gazed into the eyepiece at strange, eight-legged creatures clambering over the moss.

From New York Times

It wasn’t even a distant gleam yet in Lewis and Clark’s eyepiece.

From Seattle Times

A magnifying eyepiece, produced by 3D printing, fits cellphone cameras and takes photos of microscope slides; AI image analysis then picks out and identifies pathogens.

From Seattle Times

In the upper left corner of the paper, be sure to write the date of your drawing, the time of night, and the power of the eyepiece you used on your telescope.

From National Geographic Kids