PLATE, LAPPING. A ROUND, RECTANGULAR, OR SQUARE-SHAPED ITEM
MANUFACTURED FROM VARIOUS METALS. BY COMPARISON, ITS THICKNESS IS LESS
THAN ITS LENGTH, WIDTH, OR DIAMETER. THE LAP (ABRADING SURFACE) HAS
NARROW V-SHAPED OR STRAIGHT-SIDED GROOVES TO FACILITATE ABRADING. USED
TO PRODUCE A GEOMETRICALLY FLAT OR SMOOTH SURFACE BY ABRASION.
