thunderstone(redirected from Thunderstone (disambiguation))
1. Any of various mineral concretions, such as a belemnite, formerly supposed to be thunderbolts.
2. Archaic A flash of lightning conceived as a stone; a thunderbolt.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Archaeology) a long tapering stone, fossil, or similar object, formerly thought to be a thunderbolt
2. an archaic word for thunderbolt
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014