macadam

 
Pronunciation: /məˈkadəm/

noun

[mass noun]
  • broken stone of even size, bound with tar or bitumen and used in successively compacted layers for surfacing roads and paths.

Derivatives

macadamed

adjective

Origin:

early 19th century: named after John L. McAdam (1756–1836), the British surveyor who advocated using this material