Centrebit :: Centrebit (n.) An instrument turning on a center, for boring holes. See Bit, n., 3..
Centreboard :: Centreboard (n.) A movable or sliding keel formed of a broad board or slab of wood or metal which may be raised into a water-tight case amidships, when in shallow water, or may be lowered to increase the area of lateral resistance and prevent leeway when the vessel is beating to windward. It is used in vessels of all sizes along the coast of the United States.
Trebucket :: Trebucket (n.) A cucking stool; a tumbrel.
Trebucket :: Trebucket (n.) A military engine used in the Middle Ages for throwing stones, etc. It acted by means of a great weight fastened to the short arm of a lever, which, being let fall, raised the end of the long arm with great velocity, hurling stones with much force..
Trebucket :: Trebucket (n.) A kind of balance for weighing.