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eyepiece

[ahy-pees] /ˈaɪˌpis/
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.
Origin
1780-1790
1780-90; eye + piece
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for eye piece

eyepiece

/ˈaɪˌpiːs/
noun
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
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eye piece in Medicine

eyepiece eye·piece (ī'pēs')
n.
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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eye piece in Science
eyepiece
  (ī'pēs')   
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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