Sentence:  At the pool 's far end was the little cabana Joyce had mentioned , and on the <WSD>water</WSD> 's surface floated scattered lavender patches of limp looking lather . 
Meaning of the word marked with <WSD> tags:  binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent