Sentence:  It is doubtful that <WSD>Utopia</WSD> is still widely read because More was medieval or even because he was a martyr - indeed , it is likely that these days many who read Utopia with interest do not even know that its author was a martyr . 
Meaning of the word marked with <WSD> tags:  a book written by Sir Thomas More (1516) describing the perfect society on an imaginary island