Sentence:  Such was the impromptu that Voltaire gave to howls of <WSD>laughter</WSD> at Sans Souci and that was soon circulated in manuscript throughout the literary circles of Europe , to be printed sometime later , but with the name of Timon of Athens , the famous misanthrope , substituted for that of Rousseau . 
Meaning of the word marked with <WSD> tags:  the sound of laughing