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Adjective: optical  óp-ti-kul
  1. Of or relating to or involving light or optics
    "optical supplies"
     
  2. Relating to or using sight
    "an optical illusion";
    - ocular, optic, visual
     
  3. Of or relating to or resembling the eye
    "the optical axis of the eye";
    - ocular, optic, opthalmic

Encyclopedia: Optical