Batrachites were gemstones, supposedly found in frogs, to which ancient physicians and naturalists attributed the virtue of resisting poison. They resembled frogs in color. Toadstone is a similar mythical stone, supposed to be found in toads. The term batrachite is also used for a batrachian (or frog) fossil. ...
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http://en.wikipedia.org/wiki/Batrachite
batrachite A fossil or stone in color resembling a frog.
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http://www.wordinfo.info/words/index/info/view_unit/288/
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