n. (also selvedge)
1. a an edging that prevents cloth from unravelling (either an edge along the warp or a specially woven edging). b a border of different material or finish intended to be removed or hidden.
2 Geol. an alteration zone at the edge of a rock mass.
3 the edge-plate of a lock with an opening for the bolt.
Etymology: ME f. SELF + EDGE, after Du. selfegghe