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Polaroid (n.)

material which in thin sheets produces a high degree of plane polarization of light passing through it, 1936, proprietary name (Sheet Polarizer Co., Union City, N.J.). As a type of camera producing prints rapidly, it is attested from 1961.

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Definitions of Polaroid from WordNet

Polaroid (n.)
(trade mark) a plastic film that can polarize a beam of light; often used in sunglasses to eliminate glare;
From wordnet.princeton.edu