From school duties she was exonerated: Mrs. Fairfax had pressed me into her service, and I was all day in the storeroom, helping (or hindering) her and the cook; learning to make custards and cheese-cakes and French pastry, to truss game and garnish desert-dishes.
There are no more uses of "truss" in the book.
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The same trusses carry the weight of the roof and the ceiling.
Cordelia turns to the back pages of the catalogue, where the pictures are in gray and black and there are crutches and trusses and prosthetic devices.