understructure

[ uhn-der-struhk-cher ]

noun

a structure serving as a support; a base or foundation: The building has a strong understructure.
any thing, condition, etc., establishing support; a basis: an argument that rests on a sound understructure of knowledge.

Origin of understructure

By the June of that year the understructure of the Pier was finished, and the rest was advancing with the speed of paper-hanging.
Mushroom Town | Oliver Onions
And I confess that at this close view of the understructure of a polygamous career, I was weak enough to feel scandalized.
Captain Macedoine's Daughter | William McFee
Stan saw a Liberator smack into a bursting shell that exploded against her understructure.
A Yankee Flier with the R.A.F. | Rutherford G. Montgomery
The hair at the back of his neck lifted as his understructure raked across the hatch cover of the Jerry.
A Yankee Flier with the R.A.F. | Rutherford G. Montgomery

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