stereoscope
Noun
Meaning
An optical instrument for giving to pictures the appearance of solid forms, as seen in nature. It combines in one, through a bending of the rays of light, two pictures, taken for the purpose from points of view a little way apart. It is furnished with two eyeglasses, and by refraction or reflection the pictures are superimposed, so as to appear as one to the observer.
Source: Webster's dictionarySynonyms
Examples
The book is an annotated collection of stereoscopic photographs taken by the Victorian era photographer T. R. Williams and it is sold with a focussing stereoscope.
Piper and Carter He called it the "lenticular stereoscope", which was the first portable, 3D viewing device.
Under the stereoscope, the image of the body would seem to float slightly above the background of stars.