deckle
noun
deck·le ˈde-kəl 
: a frame around the edges of a mold used in making paper by hand
also : either of the bands around the edge of the wire of a papermaking machine that determine the width of the web
Word History
Etymology
German Deckel, literally, cover, from decken to cover, from Old High German decchen
First Known Use
1816, in the meaning defined above