Sentence:  The doctor 's wits had not left him , however , for all his sixty-eight years , and the wails were almost immediately lost in the sound of <WSD>water</WSD> rushing out from the showerhead . 
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