thunderstone
noun
thun·der·stone ˈthən-dər-ˌstōn 
1
: any of various stones (such as a meteorite or an ancient artifact) regarded as having been cast to the earth as thunderbolts
2
archaic : thunderbolt sense 1b
Example Sentences
Recent Examples on the Web There’s also a dungeon with a bunch of nasty monsters, and the eponymous Thunderstone which everyone is after. 
Jonathan H. Liu, WIRED, 10 Sep. 2010
Jonathan H. Liu, WIRED, 10 Sep. 2010 Word History
First Known Use
1598, in the meaning defined at sense 2
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