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undercarriage

noun [C]
 
/ˈʌn.dəˌkær.ɪdʒ/ US  /-dɚˌker-/ UK

Definition

the set of wheels and other parts that support a plane when it is on the ground and make it possible to take off and landParts of aeroplanes
(Definition of undercarriage noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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