Webster's English Dictionary

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optic

1. op.tic \'a:p-tik\ aj [MF optique, fr. ML opticus, fr. Gk optikos, fr. 
   opsesthai] to be going to see; akin to Gk opsis appearance, o-ps eye - more 
   at EYE 1: of or relating to vision or the eye  2: dependent chiefly on 
   vision for orientation 
2. optic n 1: EYE  2: any of the lenses, prisms, or mirrors of an optical 
   instrument