BALLAST n.
Fig.: That which gives, or helps to maintain, uprightness, steadiness, and security. It [piety] is the right ballast of prosperity. Barrow. Ballast engine, a steam engine used in excavating and for digging and raising stones and gravel for ballast. -- Ship in ballast, a ship carring only ballast.
BOLLARD n.
An upright wooden or iron post in a boat or on a dock, used in veering or fastening ropes. Bollard timber (Naut.), a timber, also called a knighthead, rising just within the stem in a ship, on either side of the bowsprit, to secure its end.