skid
1. A shoe or clog, as of iron, attached to a chain, and placed under the wheel of a wagon to prevent its turning when descending a steep hill; a drag; a skidpan; also, by extension, a hook attached to a chain, and used for the same purpose.
2. A piece of timber used as a support, or to receive pressure. Specifically, large fenders hung over a vessel's side to protect it in handling a cargo. One of a pair of timbers or bars, usually arranged so as to form an inclined plane, as form a wagon to a door, along which anything is moved by sliding or rolling.
One of a pair of horizontal rails or timbers for supporting anything, as a boat, a barrel, etc.
Origin: Icel. Ski a billet of wood. See Shide
Alternative forms: skeed.
Source: Websters Dictionary