the supporting framework underneath a vehicle, as an automobile or trailer; the structure to which the wheels, tracks, or the like are attached or fitted.
the portions of an aircraft that are below the body.

1785–95; under- + carriage

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World English Dictionary
undercarriage (ˈʌndəˌkærɪdʒ)
1.  Also called: landing gear the assembly of wheels, shock absorbers, struts, etc, that supports an aircraft on the ground and enables it to take off and land
2.  the framework that supports the body of a vehicle, carriage, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1794, from under + carriage. Meaning "landing gear of an aircraft" is recorded from 1911.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
State television added that part of the aircraft had burned and the left wing
  and undercarriage were torn off.
Pulling off onto the soft shoulder, he felt a certain resistance from the
Plant materials can get stuck in your tires and undercarriage.
Repairing or replacing tires and repairing undercarriage damage as a result of
  operating in severe debris conditions.
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