Sentence:  In September ' 76 Thomas Huxley , <WSD>Darwin</WSD> 's famous disciple , came from England to speak in a crowded auditorium at the formal opening of the University ; and although it was a school for men only , it afforded Henrietta an opportunity to attend its public lectures . 
Meaning of the word marked with <WSD> tags:  English natural scientist who formulated a theory of evolution by natural selection (1809-1882)