Revetment n. (Written also revêtement) (Fort. & Engin.) A facing of wood, stone, or any other material, to sustain an embankment when it receives a slope steeper than the natural slope; also, a retaining wall.
... the recent Russian excavations proves that the church was decorated with mosaics, while the remains of iron plugs in the western wall for holding marble slabs show that the building had the customary marble revetment. But what is curious is to find the mortar pressed over the face of the stones, and broad decorative joints formed by ruled incised lines and colour. Mr. W. S. George suggests that this was a temporary decoration executed pending some delay in the covering of the ... — Byzantine Churches in Constantinople - Their History and Architecture • Alexander Van Millingen