Sentence:  The solitary, lumbering trolls of Scandinavian mythology would sometimes be turned to stone by exposure to <WSD>sunlight</WSD>. Barack Obama is hoping that several measures announced on June 4th will have a similarly paralysing effect on their modern incarnation, the patent troll. 
Meaning of the word marked with <WSD> tags:  All the electromagnetic radiation given off by the Sun, especially that in the visible spectrum that bathes the Earth.