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Pavement made with layers of crushed granite or greenstone. Macadam is usually sealed with tar or asphalt to produce a hard, smooth water-resistant roadway called tarmac. Macadam pavement was invented by John L. McAdam in 1815, a Scottish civil engineer.


  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
  • 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
  • Encyclopedia Britannica, Comment: "macadam" Encyclopædia Britannica Premium Service. [Accessed 28 Sept. 2005].

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