eyepiece

[ ahy-pees ]

/ ˈaɪˌpis /

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noun

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.

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Origin of eyepiece

First recorded in 1780–90; eye + piece

Words nearby eyepiece

eye of a hurricane, eye of a needle, eye of day, eyeopener, eye-opening, eyepiece, eye pillow, eyepit, eye point, eye-popper, eye-popping

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use eyepiece in a sentence

When astronomers stopped looking through the eyepiece and started focusing on photographic plates instead, the planets became even more obscure.
The Planets with the Giant Diamonds Inside - Issue 102: Hidden Truths|Corey S. Powell|July 7, 2021|Nautilus
However, at the long wavelengths of radio light, the dishes of radio telescopes are shiny too, reflecting radio waves from the sky up to a receiver, just as visible light reflects off a telescope’s mirror and into an eyepiece.
How Radio Astronomy Reveals the Universe|Emily Levesque|April 13, 2021|Quanta Magazine
Before beginning an exposure the focus is adjusted by means of a high-power positive eyepiece.
Photographs of Nebul and Clusters|James Edward Keeler
Looking through the eyepiece, the young inventor stood as though transfixed.
Tom Swift and His Giant Telescope|Victor Appleton

Beware of the popular error that an object held close in front of a telescope can be seen by an observer at the eyepiece.
A Text-Book of Astronomy|George C. Comstock
Insert the eyepiece micrometer inside the ocular and adjust the stage micrometer on the stage of the microscope.
The Elements of Bacteriological Technique|John William Henry Eyre
This is an ordinary eyepiece fitted with an adjustable square diaphragm operated by a lever projecting from the side of the mount.
The Elements of Bacteriological Technique|John William Henry Eyre

British Dictionary definitions for eyepiece

eyepiece

/ (ˈaɪˌpiːs) /

noun

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

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

Medical definitions for eyepiece

eyepiece

[ ī′pēs′ ]

The compound lens located at the end of a microscope tube nearest the eye.eyeglass

Scientific definitions for eyepiece

eyepiece

[ ī′pēs′ ]

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