Definitions

from The Century Dictionary.

  • noun A variety of argillaceous oxid of iron, found in masses varying from the size of a walnut to that of a man's head.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) A concretionary nodule of clay ironstone, of the size of a walnut or larger, so called by the ancients, who believed that the eagle transported these stones to her nest to facilitate the laying of her eggs; aëtites.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy A concretionary nodule of clay ironstone.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

eagle +‎ stone: the ancients believed that the eagle transported these stones to its nest to facilitate egg-laying.

Examples

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