Webster's English Dictionary

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perimeter

Cross references:
  1. circumference         
 
pe.rim.e.ter or peri.met.ri.cal \p*-'rim-*t-*r\ \.per-*-'me-trik\ 
   \-tri-k*l\ \-k(*-)le-\ \p*-'rim-*-tre-\ n [F pe`reme'tre, fr. L perimetros, 
   fr. Gk, fr. peri- + me]tron measure - more at MEASURE 1a: the boundary of a 
   closed plane figure  1b: the length of this boundary  2: a line or strip 
   bounding or protecting an area  3: outer limits  - peri.met.ri.c aj