kentledge

Pig iron used as permanent ballast.

Nautical, pig-iron laid in the hold of a ship for ballast. Also kintledge.

In the British service, condemned shot, shell, and similar unserviceable articles.

Pigs of iron used for ballast.

Weights (often scrap or pig iron) used as permanent ballast on ships.

A system of weights (usually concrete or cast-iron blocks) used for load-testing piled foundations.