underframe

Etymology

From under- + frame.

underframe means the supporting structure of a piece of furniture, a vehicle, etc. Lexicurio rates it Sui generis — a strength score of 85 out of 100.

noun

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.”