a macadamized road or pavement.
the broken stone used in making such a road.

1815–25; named after J. L. McAdam (1756–1836), Scottish engineer who invented it Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
macadam (məˈkædəm)
a road surface made of compressed layers of small broken stones, esp one that is bound together with tar or asphalt
[C19: named after John McAdam (1756--1836), Scottish engineer, the inventor]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1824, named for inventor, Scot. civil engineer John L. McAdam (1756-1836), who developed a method of leveling roads and paving them with gravel and outlined the process in his pamphlet "Remarks on the Present System of Road-Making" (1822). Originally, road material consisting of a solid mass of stones
of nearly uniform size laid down in layers; he did not approve of the use of binding materials or rollers. The idea of mixing tar with the gravel began 1880s. Verb macadamize is first recorded 1826.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The place was at the end of a sloping driveway that started out as macadam but quickly diminished to dirt and gravel.
The macadam ran on straight and narrow, bisecting the spring-green wilderness of fronds.
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