Named after Scottish engineer John Loudon McAdam (1756–1836), who invented the process of macadamization. Used for describing road surfaces originally constructed using the McAdam method, but now sometimes used for any road or street.
- (uncountable) The surface of a road consisting of layers of crushed stone (usually tar-coated for modern traffic).
- (US, dated, countable) Any road or street.
- (transitive) To cover or surface with macadam.
macadam m (plural macadams or macadam)