outer boundary Definition

periphery, fringe, perimeter, border, edge, surface, outside, peripheral, surfacing, bound, circumference, depth, internal, list, outline, ring, ambit, area, aut, bar, bordering, but, convex, cover, curb, deep, end, exterior, frame, frontier, land, limit, liner, margin, out, outlined, outskirt, penumbra, radius, rim, roof, side, superficies, verge, wall, bounds, horizon, dut, inner, rail, shorts, slop, stone, shard, snake, addendum, airspace, alien, altostratus, back, bail, bailey, bak, barred, bars, base, black, blackhole, bordure, brim, cage, cant, cell, center, corner, cornering, cortical, cosmic, costa, crust, curbing, curbstone, curtain wall, deltoid, door, envelope, environs, eukaryote, exosphere, external, extreme, eye, eyes, face, fillet, flies, fly, fur, gable, gallery,