underframe

[uhn-der-freym]
noun
the lower frame on which a vehicular structure rests: the underframe of a bus.

Origin:
1850–55; under- + frame

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
underframe

noun
the internal supporting structure that gives an artifact its shape; "the building has a steel skeleton" [syn: skeleton
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Between body bolsters a conventional car has an underframe of approximately uniform cross section and uniform strength.
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