stereomonoscope

from The Century Dictionary.

• noun An instrument with two lenses for exhibiting on a screen of ground glass a single picture so as to give it all the effect of solidity.

from the GNU version of the Collaborative International Dictionary of English.

• noun An instrument with two lenses, by which an image of a single picture projected upon a screen of ground glass is made to present an appearance of relief, and may be viewed by several persons at once.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An instrument with two lenses, by which an image of a single picture projected on a screen of ground glass is made to present an appearance of relief, and may be viewed by several persons at once.