Definition of tankers:
(n) :
(nautical) A tankship, a vessel used to transport large quantities of fluid.
(n) :
(automotive, US) A motor truck with a tank to hold bulk liquid (with or without internal baffles).
(n) :
(automotive, UK) A fuel tanker, petrol tanker, road tanker.
(n) :
(aviation, usually military) An aircraft carrying a large supply of jet fuel or avgas for aerial refueling of other aircraft, plus equipment allowing the in-air transfer of fuel.
(n) :
(aviation, firefighting) An aircraft built or modified to carry water and/or fire retardant for dropping on wildfires.
(n) :
(rail transport) A tank car.