a paving material that consists of crushed stone rolled and bound with a mixture of tar and bitumen, esp as formerly used for a road, airport runway, etc Full name tarmacadam (ˌtɑːməˈkædəm) See also macadam
the tarmac, a runway at an airport on the tarmac at Nairobi airport
verb -macs, -macking, -macked
(transitive) (usually not capital) to apply tarmac to
1903 as a trademark name, short for tarmacadam (1882) "pavement created by spraying tar over crushed stone," from tar (1) + John L. McAdam (see macadam). By 1919, tarmac was being used generally in Great Britain for "runway."