eagle stone


a concretionary lump of ironstone about the size of a walnut, formerly believed to be carried by eagles to their nests as a magical aid in laying eggs.

1595–1605; eagle + stone

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World English Dictionary
eaglestone (ˈiːɡəlˌstəʊn)
a hollow oval nodule of clay ironstone, formerly thought to have magical properties

Collins English Dictionary - Complete & Unabridged 10th Edition
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