Bottom

Buoyancy

The upward force exerted by water on a submerged body — the property that lets an object f…

Bilge pump

A manual or electric pump fitted to remove water from the bilge; most cruising yachts carr…

Bow Spring

A dockline led from the bow aft along the dock, preventing the boat from surging forward.

Broach

A sudden, unintended round-up into the wind, usually while running or reaching in strong b…

Block

The marine term for a pulley — a sheave in a housing through which a line runs.

Boom

The horizontal spar that extends aft from the mast and carries the foot of the mainsail.