Sentence:  Bob Gowrie appeared in the doorway of the <WSD>panhouse</WSD>. Like his son, he was flushed and sweating and clouded round with caustic steam. The odours of a saltpan in full production wafted into the hazy air and coiled away like cottonseed across the pond. 
Meaning of the word marked with <WSD> tags:  A building in which seawater is evaporated to make salt.