Su Civraxiu is referring to a large, hard wheat bran-bread loaves with a hard crust and soft center. They are to be cut into slices when served. It is a typical bread served in Sulcis, one of the 7 Regions of Sardinia

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Other definition:
Su Civraxiu refers to a large, hard wheat bran-bread loaves, to be cut into slices, with a hard crust and soft centre. It is a specialty bread in Cagliari, one of the Regions of Sardinia