/pəˈrɪmɪtər/
per·im·eter
BrE /pəˈrɪmɪtə(r)/
NAmE /pəˈrɪmɪtər/
the outside edge of an area of land
Guards patrol the perimeter of the estate.
a perimeter fence/track/wall
(mathematics)
the total length of the outside edge of an area or a shape
➡ compare circumference