Definition of "macadam" [macadam]

• Pavement made of layers of compacted broken stone, now usually bound with tar or asphalt. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "To give you a feel for how long ago this was the main beneficiaries of the macadam were the new fangled bicycle-men."
• "The splendid kunkah is now gradually giving place to ordinary macadam, which is far less desirable, the heavy, pelting rain washing away the clay and leaving the surface rough."
• "John McAdam designed the first modern highway of inexpensive paving material of soil and stone aggregate known as macadam during the Industrial Revolution."