Ornamental areas of distinct pattern, material, color, or shape around the edge or boundary of something. With regard specifically to tapestries, refers to the areas around the central field outside the inner guard and within the guard that edges the outer sides of the tapestry. For the narrow surfaces showing the 'thickness' or smallest dimension of thin, flat objects, as distinguished from the broad surfaces, see "edges (object components)."

Source: AAT

http://vocab.getty.edu/page/aat/300010252