Sentence:  Duclos understood what was bothering <WSD>Rousseau</WSD> : that the writer of the Prosopopoeia of Fabricius should now become known as the writer of an amusing little operetta . 
Meaning of the word marked with <WSD> tags:  French philosopher and writer born in Switzerland; believed that the natural goodness of man was warped by society; ideas influenced the French Revolution (1712-1778)