Definition of gas line:
(n) :
A pipeline used to transport natural gas.
(n) :
A pipe or hose connecting a gas appliance to the main supply of natural gas for the apartment, office or building.
(n) :
The tubing that carries gasoline in a vehicle from the gas tank to the engine.
(n) :
A queue out of a service station where people in automobiles wait their turn to make a purchase of gasoline.