n. In mining, the distance at right angles to the drift or adit measured from the roof or hanging wall to the foot wall in a lode vein or lens.n. The state or property of being thick, in any sense; specifically, that dimension of a solid body which is at right angles both to its length and to its breadth; the third or least dimension of a solid.n. That which is thick; the thick of anything; the dense, heavy, deep, or solid part.n. A fold, layer, or sheet, as of cloth or paper.n. In founding, the sand or loam placed temporarily in a mold while it is being prepared for easting. It is afterward removed, and its place is filled with the molten metal.To reduce to a uniform thickness before dressing to shape: said of boards and timber.