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