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1) A heavy material used to provide weight and/or stability. Ballast is commonly used in hot-air balloons, ships, and submarines. Examples of materials used for ballast include Water, Sand, and Iron.

2) Crushed Concrete, Slag, or Stone used as a foundation for railroad beds.

Resources and Citations

  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

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