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.

1780–90; eye + piece

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World English Dictionary
eyepiece (ˈaɪˌpiːs)
the lens or combination of lenses in an optical instrument nearest the eye of the observer

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

eyepiece eye·piece (ī'pēs')
The compound lens located at the end of a microscope tube nearest the eye. Also called eyeglass.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
eyepiece   (ī'pēs')  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
To confirm eyepiece diameter, remove an eyepiece, and inspect the diaphragm size inside the eyepiece.
If the field is not in focus, twist the eyepiece until the graduations are clearly distinguishable.
There are dark shadows in the field which move as you turn around the eyepiece.
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