Sentence:  He occupied the position of <WSD>panhouse</WSD> operator, and was generally in charge of supervising and maintaining the production processes designed to take place in the <WSD>panhouse</WSD>. The <WSD>panhouse</WSD> is a ten-story building in which raw sugar is converted in several stages to granulated sugar. 
Meaning of the word marked with <WSD> tags:  A factory in which raw sugar is refined.