edge
noun
the boundary of a surface
Synonymsbordera line determining the limits of an area
a sharp side formed by the intersection of two surfaces of an object
“he rounded the edges of the box”
the attribute of urgency in tone of voice
“his voice had an edge to it”
Synonymssharpnessa slight competitive advantage
“he had an edge on the competition”
the outside limit of an object or area or surface; a place farthest away from the center of something
“the edge of the leaf is wavy”
“she sat on the edge of the bed”
verb
Source: WordNet 3.1, Princeton University
