Webster's English Dictionary

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rectilinear

rec.ti.lin.ear \.rek-t*-'lin-e--*r\ aj [LL rectilineus, fr. L rectus + 
   linea line] 1: moving in or forming a straight line  2: characterized by 
   straight lines  3: PERPENDICULAR  4: corrected for distortion so that 
   straight lines are imaged accurately <(~ lens} - rec.ti.lin.ear.ly av