Sentence:  Argiento never left his side , keeping the <WSD>water</WSD> boiled , applying hot compresses throughout the night . 
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