Outer margin (4)
I believe the answer is:
edge
(Other definitions for edge that I've seen before include "Surface boundary" , "Advantage (informal)" , "Rim or sharp side of knife" , "Intense/striking quality" , "Outer limit" .)
I believe the answer is:
edge
(Other definitions for edge that I've seen before include "Surface boundary" , "Advantage (informal)" , "Rim or sharp side of knife" , "Intense/striking quality" , "Outer limit" .)