#Polaroid  (trade name) a plastic film that can polarize a beam of light; often used in sunglasses to eliminate glare
  supertype:  #plastic_film__plasticfilm__film  a thin sheet of (usually plastic and usually transparent) material used to wrap or cover things
  part of:  #sunglasses__dark_glasses__shades  spectacles that are darkened or polarized to protect the eyes from the glare of the sun; "he was wearing a pair of mirrored shades"

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