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

macadam

noun
 
/məˈkædəm/
 
/məˈkædəm/
 [uncountable]
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  1. a road surface made of layers of broken stones, mixed with tarTopics Transport by car or lorryc2
    Word Originearly 19th cent.: named after John L. McAdam (1756–1836), the British surveyor who advocated using this material.
See macadam in the Oxford Advanced American Dictionary
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