Outer coverings or containers that hold or protect something inside, like sausage casings or the outer layer of a building.
From Middle English 'cas' (container), derived from Old Norse 'kas,' combined with the suffix '-ing' to create a noun for protective outer layers.
Natural sausage casings are made from cleaned animal intestines, and they've been used for thousands of years—they're semi-permeable, which means smoke and salt can penetrate while moisture escapes during curing.
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