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
stereoscope in American English
(ˈstɛriəˌskoʊp; ˈstɪriəˌskoʊp)
noun
an instrument with two eyepieces through which a pair of photographs of the same scene or subject, taken at slightly different angles, are viewed side by side: the two photographs are seen as a single picture apparently having depth, or three dimensions