Polaroid
来自Big Physics
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1930s: from polarize + -oid.
wiktionary
Genericization of the trademark Polaroid, owned by Polaroid Corporation.
etymonline
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.
