Sentence:  Sepia Delft tiles surrounded the fireplace, their crudely drawn Biblical scenes in faded cyclamen blending with the pinkish pine, while above them, instead of a mantelshelf, there was an <WSD>archway</WSD> high enough to form a balcony with slender balusters and a tapestry-hung wall behind. 
Meaning of the word marked with <WSD> tags:  A doorway with a semilunar-shaped top.