Quiz: Remember the definition of mal de mer?
stereoscope ster·e·o·scope (stěr'ē-ə-skōp', stēr'-)
An optical instrument with two eyepieces used to impart a three-dimensional effect to two photographs of the same scene taken at slightly different angles.
An optical instrument through which two slightly different images (typically photographs) of the same scene are presented, one to each eye, providing an illusion of three dimensions. Modern virtual reality equipment often uses a stereoscope that presents animated, computer-generated images to the eyes, rather than photographic images. ◇ A stereogram is a single pair of photographic images used in a stereograph. See also stereoscopic vision.