Definition of landing gears:
(n) :
(uncountable, countable, aviation) The wheels, tyres, brakes, shock absorbers etc of an aircraft; its undercarriage.
(n) :
(countable, aviation) Any of the assemblies which support an aircraft when it is on the ground.
(n) :
(trucking) The bipod stand found near the front end underneath a truck trailer, used to keep the trailer level when not attached to a tractor truck.