what is tarmac made of
tarmac. n. 1. (Civil Engineering) 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 See also macadam. 2. (Aeronautics) the tarmac a runway at an airport: on the tarmac at Nairobi airport.armac. n. 1. (Civil Engineering) 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 See also macadam. 2. (Aeronautics) the tarmac a runway at an airport: on the tarmac at Nairobi airport.