Oxford Dictionary English undercarriage noun noun BrE BrE//ˈʌndəkærɪdʒ// ; NAmE NAmE//ˈʌndərkærɪdʒ// (also landing gear) Parts of a plane Add to my wordlistjump to other results enlarge image the part of an aircraft, including the wheels, that supports it when it is landing and taking off See related entries: Parts of a planeSee undercarriage in the Oxford Advanced American DictionaryCheck pronunciation: undercarriage oxfordlearnersdictionaries.com