'landing gear' definitions:

Definition of 'landing gear'

(from WordNet)
noun
An undercarriage that supports the weight of the plane when it is on the ground

Definition of 'landing gear'

From: GCIDE
  • landing gear \land"ing gear`\, n. The wheels and attached structures under an airplane that support it and allow it to move when on the ground; also, the floats or pontoons of an amphibious airplane together with their supporting structures. Landing gear may be fixed rigidly in place, or retractable when in flight. [PJC]