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orthoscope

American  
[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.

orthoscope British  
/ ˈɔːθəʊˌskəʊp /

noun

  1. obsolete  med 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

Etymology

Origin of orthoscope

First recorded in 1890–95; ortho- + -scope

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.