adj 1  :  of or relating to the science of optics  2 a  :  of or relating to vision  :  VISUAL  b  :  using the properties of light to aid vision <an instrument>   3  :  of, relating to, or utilizing light <an emission>  <an telescope>  < microscopy>  .
 
 
 
Similar sounding terms:  op·ti·cal·ly 
 
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