0 heavy matter such as sand, stone, or water that is used at the bottom of a ship or a hot-air balloon to make it heavier, or the small stones on which railways and roads are made:
The weed may have been accidentally imported in soil used as ship ballast.
A ship sailing with an empty hold will have filled its ballast tanks at its source port.
He needed his platoon mates around him. They were his ballast.
The team is struggling because of a shortage of the ballast that senior players provide.
The boat had 35 tons of cement block ballast that caused it to ride lower in the water.
Zebra mussels are believed to have come to the United States in ballast water dumped by ships from Europe.
On discharging part of the ballast, the balloon ascended to the height of 200 yards.
The huge Christmas tree is held down by two tons of ballast.
They have failed to repair broken and cracked rails and failed to replace sleepers and stone ballast.
His deep voice added some needed ballast to this soprano-heavy score.
Another potential carrier would have been ships' ballast, especially from ships that were wrecked at the isthmus.
Furthermore, the fluorescent sources had conventional magnetic ballasts and therefore were subject to luminous flicker, whereas incandescent lamps do not flicker.
