Part of speech: adjective

Pertaining to optics or to the eyesight; assisting vision; optic.

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Usage examples "optical":

  1. In the laboratory, on the other hand, the place of the different instruments will be determined by a classification according to methods, such as weighing and measuring, observations of time, optical and electrical methods of observation, and so on. - "Five of Maxwell's Papers", James Clerk Maxwell.
  2. And yet- if that devilish rum optical delusion hadn't come off- why I should have dozed on comfortably, and never have heard that chump's shout for help. - "The Heath Hover Mystery", Bertram Mitford.
  3. I repeated the time- worn argument about optical illusions, etc. - "Uncanny Tales", Mary Louisa Molesworth.