Boundary around something (9)
I believe the answer is:
perimeter
(Other definitions for perimeter that I've seen before include "Exterior of a plane figure" , "Prime tree (anag.)" , "Boundary of enclosure" , "Outer boundary" , "Bound" .)
I believe the answer is:
perimeter
(Other definitions for perimeter that I've seen before include "Exterior of a plane figure" , "Prime tree (anag.)" , "Boundary of enclosure" , "Outer boundary" , "Bound" .)