Main Entry: edge
Part of Speech: noun
Definition: border, outline
Synonyms: bend, berm, bound, boundary, brim, brink, butt, circumference, contour, corner, crook, crust, curb, end, extremity, frame, fringe, frontier, hem, hook, ledge, limb, limit, line, lip, margin, molding, mouth, outskirt, peak, perimeter, periphery, point, portal, rim, ring, shore, side, skirt, split, strand, term, threshold, tip, trimming, turn, verge
Something tells me Mirror's periphery wouldn't have had the same ring to it.