Sentence:  The solitary, lumbering <WSD>trolls</WSD> of Scandinavian mythology would sometimes be turned to stone by exposure to sunlight. Barack Obama is hoping that several measures announced on June 4th will have a similarly paralysing effect on their modern incarnation, the patent <WSD>troll</WSD>. 
Meaning of the word marked with <WSD> tags:  A supernatural being of varying size, now especially a grotesque humanoid creature living in caves or hills or under bridges. (from early 17th c.)