Webster's English Dictionary

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peripheral

pe.riph.er.al \p*-'rif-(*-)r*l\ \-e-\ aj 1: of, relating to, or forming a 
   periphery  2: located away from a center or central portion : EXTERNAL  3: 
   of, relating to, or involving the surface of the body  - pe.riph.er.al.ly 
   av