tar·mac 
(tärmăk′)
(tärmăk′)n.
1. A tarmacadam road or surface.
2. A paved surface of a runway, taxiway, or apron at an airport.
v. tar·macked, tar·mack·ing, tar·macs
v.tr.
To cause (an aircraft) to sit on a taxiway.
v.intr.
To sit on a taxiway. Used of an aircraft.
[Originally a trademark.]