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macadam

noun
🔊/məˈkædəm/
🔊/məˈkædəm/
 [uncountable]
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  1. a road surface made of layers of broken stones, mixed with tar柏油碎石路面Topics Transport by car or lorryc2
    Word Originearly 19th cent.: named after John L. McAdam (1756–1836), the British surveyor who advocated using this material.