Also macadam and macadan, eponymous by the nineteenth-century Scottish engineer John Loudon Mac Adam. Zahorra of discontinuous granulometry, that is, with layers of stones of different sizes culminating with fine gravel or sand compacted with rollers for the construction of roads or roads without asphalt. It is also called the technique of building roads with these well-compressed aggregates, a technique devised by the scottish engineer mentioned.
