An instrument producing two horizontally separated images of the same object, providing a single image with an appearance of depth. [stereo- + G. skopeo, to view]
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ste·reo·scope 'ster-ē-ə-.skōp, 'stir- n an optical instrument with two eyepieces for helping the observer to combine the images of two pictures taken from points of view a little way apart and thus to get the effect of solidity or depth
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ster·eo·scope (sterґe-o-skōp″) [stereo- + -scope] an instrument for producing the appearance of solidity and relief by combining the images of two pictures of an object seen from slightly dissimilar viewpoints.Medical dictionary. 2011.