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 .
 
   
 
Similar sounding terms:  hys·ter·o·scope  ste·re·os·co·py 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.