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orthoscope

[awr-thuh-skohp] /ˈɔr θəˌskoʊp/
noun, Ophthalmology
1.
(formerly) an instrument for examining the internal structures of the eye through a layer of water that neutralizes the refraction of the cornea.
Origin
1890-1895
1890-95; ortho- + -scope
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for orthoscope

orthoscope

/ˈɔːθəʊˌskəʊp/
noun
1.
(med, obsolete) a 19th-century instrument for viewing the fundus of the eye through a layer of water, which eliminates distortion caused by the cornea
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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orthoscope in Medicine

orthoscope or·tho·scope (ôr'thə-skōp')
n.
An instrument used to examine the eye that eliminates corneal refraction by means of a layer of water.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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