Sentence:  For the protection of the marble's fine texture, surfaces subject to weathering (e.g. antae) were covered in a coloured wash. Dove-tail clamps with an <WSD>embolon</WSD> bind the treasury's blocks; similar clamps without an <WSD>embolon</WSD> bind the ashlars of the stereobate. 
Meaning of the word marked with <WSD> tags:  Anything wedge-shaped.