periphery
Cross references: 1. circumference pe.riph.ery \p*-'rif-(*-)re-\ n [MF peripherie, fr. LL peripheria, fr. Gk periphereia, fr. Xperipherein to carry around, fr. peri- + pherein to carry - more at BEAR 1: the perimeter of a circle or other closed curve; also : the peri meter of a polygon 2: the external boundary or surface of a body 3a: the outward bounds of something as distinguished from its internal regi ons or center : CONFINES 3b: an area lying beyond the strict limits of a thing 4: the regions in which nerves terminate
Webster's English Dictionary