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Related to toadstone: Bufonite


A stone once worn as a charm and believed to have been formed in the body of a toad.
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.


(Geological Science) rare an amygdaloidal basalt occurring in the limestone regions of Derbyshire
[C18: perhaps from a supposed resemblance to a toad's spotted skin]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



any of various stonelike objects, usu. fossilized animal parts, formerly supposed to have been formed in the body of a toad, worn esp. as amulets to protect against poison.
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References in periodicals archive ?
Of the three tablets above there is no trace of the "Section" or the "Ironstone and coals," and the only contender for the 1808 tablet is one composed of "eighteen varieties of toadstone" [a Derbyshire name for basalt] which we have but is not mentioned in any of the catalogs.
(or Plate) 531, a depiction of toadstone, an amygdaloidal basalt, from British Mineralogy.