Sentence:  Mark stopped the car and switched off the lights and they sat looking at the <WSD>water</WSD> , which , there being no moon out , at first could be distinguished from the sky only by an absence of stars . 
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