noun, plural underbodies.
the bottom or underneath part, as of a mechanism or animal: the underbody of a tank.
Nautical. the portion of a hull that is normally underwater.

1615–25; under- + body

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World English Dictionary
underbody (ˈʌndəˌbɒdɪ)
n , pl -bodies
the underpart of a body, as of an animal or motor vehicle

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Engineers focused on making the underbody as flat as possible to smooth airflow
  under the car and reduce noise.
Its underbody is smoothed with various fairing devices.
Remember to work from the top of the trailer moving to the underbody when
  restoring the exterior.
Even if no more time is lost, he will have only eight weeks to test the
  underbody, the car's structural base.
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