[ ahy-pees ]

  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.

Origin of eyepiece

First recorded in 1780–90; eye + piece

Words Nearby eyepiece

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use eyepiece in a sentence

  • 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.

  • This is an ordinary eyepiece fitted with an adjustable square diaphragm operated by a lever projecting from the side of the mount.

British Dictionary definitions for eyepiece


/ (ˈaɪˌpiːs) /

  1. 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

Scientific definitions for eyepiece


[ īpēs′ ]

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

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.