stereoscope

[ster-ee-uh-skohp, steer-]
noun
an optical instrument through which two pictures of the same object, taken from slightly different points of view, are viewed, one by each eye, producing the effect of a single picture of the object, with the appearance of depth or relief.

Origin:
1830–40; stereo- + -scope

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Collins
World English Dictionary
stereoscope (ˈstɛrɪəˌskəʊp, ˈstɪər-)
 
n
an optical instrument for viewing two-dimensional pictures and giving them an illusion of depth and relief. It has a binocular eyepiece through which two slightly different pictures of the same object are viewed, one with each eye

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

stereoscope ster·e·o·scope (stěr'ē-ə-skōp', stēr'-)
n.
An optical instrument with two eyepieces used to impart a three-dimensional effect to two photographs of the same scene taken at slightly different angles.

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
stereoscope   (stěr'ē-ə-skōp')  Pronunciation Key 
An optical instrument through which two slightly different images (typically photographs) of the same scene are presented, one to each eye, providing an illusion of three dimensions. Modern virtual reality equipment often uses a stereoscope that presents animated, computer-generated images to the eyes, rather than photographic images. ◇ A stereogram is a single pair of photographic images used in a stereograph. See also stereoscopic vision.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Participants in this study were simultaneously shown a different image to each
  of their eyes using a mirror stereoscope.
He uses the new instrument, the stereoscope, as a tool for thinking about how
  our eyes see solid things.
One of the boys' toys is also in the sitting room: a stereoscope.
Any buyer of the photographs who wishes to see the three-dimensional view can
  buy pairs and view them through the stereoscope.
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