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stereoscope

(ster′ē ə skōp′, stir′-)

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

See stereoscope in American Heritage Dictionary 4

noun

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.

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