Underframe

noun

Definitions

Noun
  1. 1
    The supporting structure of a piece of furniture, a vehicle, etc.

    "The main fuel tank is slung from the underframe midway between the two bogies, and its capacity of 420 gal. supplies both the main engine and the train heating boiler."

  2. 2
    the internal supporting structure that gives an artifact its shape wordnet

Etymology

From under- + frame.

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