n. A thin slab or plank, a piece of marble, slate, wood, or other material, generally long and narrow, fixed horizontally to a wall, and used for supporting small objects; in general, a narrow flat surface, horizontal or nearly so, and raised above a larger surface, as of a floor or the ground.n. In ship-building, an inner timber, or line of timbers, following the sheer of the vessel, and bolted to the inner side of ribs, to strengthen the frame and sustain the deck-beams. See cut under beam, 3.n. The charging-bed of a furnace.n. In scissors, the bottom of the countersink which receives the head of the screw uniting the two bladesSame as shelve.n. A rock, ledge of rocks, reef, or sand-bank in the sea, rendering the water shallow and dangerous to ships; a reef or shoal; a shallow spot.n. A projecting layer or ledge of rock on land.n. The bed-rock; the surface of the bed-rock; the rock first met with after removing or sinking through the superficial detritus.