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1. Broken stone used in macadamized roadways
    
2. A paved surface having compressed layers of broken rocks held together with tar
   - tarmacadam, tarmac

1. Surface an area with tarmac
   "macadam the road";
   - macadamize, macadamise [Brit], tarmac

Derived forms: macadamed, macadams

Type of: coat, paved surface, pavement, paving, paving material, surface

Encyclopedia: Macadam, John