n. 1. The act or process of one who packs. [ 1913 Webster ]

2. Any material used to pack, fill up, or make close. Specifically (Mach.): A substance or piece used to make a joint impervious; as: (a) A thin layer, or sheet, of yielding or elastic material inserted between the surfaces of a flange joint. (b) The substance in a stuffing box, through which a piston rod slides. (c) A yielding ring, as of metal, which surrounds a piston and maintains a tight fit, as inside a cylinder, etc. [ 1913 Webster ]

3. (Masonry) Same as Filling. [ Rare in the U. S. ] [ 1913 Webster ]

4. A trick; collusion. [ Obs. ] Bale. [ 1913 Webster ]

Cherd packing (Bridge Building), the arrangement, side by side, of several parts, as bars, diagonals, a post, etc., on a pin at the bottom of a chord. Waddell. --
Packing box, a stuffing box. See under Stuffing. --
Packing press, a powerful press for baling cotton, wool, hay, etc. --
Packing ring. See Packing, 2 (c), and Illust. of Piston. --
Packing sheet. (a) A large cloth for packing goods. (b) A sheet prepared for packing hydropathic patients. [ 1913 Webster ]

n. 1. A place where foodstuffs are processed and packed; as, they came from an apple packinghouse. [ WordNet 1.5 ]

2. A plant where livestock are slaughtered and processed and packed as meat products.
Syn. -- packing plant. [ WordNet 1.5 ]