Definition of macadam noun from the Oxford Advanced Learner's Dictionary

 

macadam

 noun
noun
BrE BrE//məˈkædəm//
 
; NAmE NAmE//məˈkædəm//
 
[uncountable] Features of roads
 
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a road surface made of layers of broken stones, mixed with tar See related entries: Features of roads Word Origin early 19th cent.: named after John L. McAdam (1756–1836), the British surveyor who advocated using this material.
See the Oxford Advanced American Dictionary entry: macadam