Sentence:  The reverse side is divided into three <WSD>registers</WSD>. In the first <WSD>register</WSD> is the name of Narmer represented as a fish and a chisel inscribed in the "serekh". 
Meaning of the word marked with <WSD> tags:  A distinct horizontal (or, more rarely, vertical) section of a work of art or inscription that is divided into several such sections