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Heavy material that is placed in the hold of a ship, to provide stability.
heavy material placed in the hold of a vessel
material laid to form a bed for a road
to stabilize a ship with ballast
to lay ballast on the bed of a railway track
(nautical) Heavy material that is placed in the hold of a ship (or in the gondola of a balloon), to provide stability.
(figuratively) Anything that steadies emotion or the mind.
Coarse gravel or similar material laid to form a bed for roads or railroads.
(construction) A material, such as aggregate or precast concrete pavers, which employs its mass and the force of gravity to hold single-ply roof membranes in place.
(electronics) device used for stabilizing current in an electric circuit (e.g.in a tube lamp supply circuit)
To stabilize or load a ship with ballast.
To lay ballast on the bed of a railroad track.