n. In paper-making: In hand paper-making, a rectangular frame laid upon the wire mold on which the paper-pulp is placed, to confine it within the limits of the required size of sheet; in machine paper-making, a belt of linen and caoutchoue placed on either side of the apron, to keep the pulp from spreading out laterally and making the paper wider than is desired.n. The rough or raw edge of paper; specifically, the ragged edge of handmade paper, produced by the deckle.