noun, masculine/ba.last/plural: ballasts
heavy material that is placed in the hold of a ship (or in the gondola of a balloon), to provide stability; coarse gravel or similar material laid to form a bed for roads or railroads
/ba.last/
heavy material that is placed in the hold of a ship (or in the gondola of a balloon), to provide stability; coarse gravel or similar material laid to form a bed for roads or railroads