border - noun

a line that indicates a boundary

the boundary line or the area immediately inside the boundary

the boundary of a surface

a decorative recessed or relieved surface on an edge

a strip forming the outer edge of something

border - verb

• extend on all sides of simultaneously; encircle
• form the boundary of; be contiguous to
• enclose in or as if in a frame
• provide with a border or edge
• lie adjacent to another or share a boundary

border - thesaurus

abut   adjoin   borderline   bound   butt   delimitation   edge   environ   frame   march   margin   mete   molding   moulding   perimeter   ring   skirt   surround