Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The petrified fruit of Chara hispida, a species of stonewort.

from the GNU version of the Collaborative International Dictionary of English

  • n. The petrified fruit of the Chara hispida, a species of stonewort. See stonewort.

from The Century Dictionary and Cyclopedia

  • n. A petrified spiral seed-vessel of plants of the genus Chara, found in fresh-water deposits, and formerly supposed to be a shell.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek circle, ring + fruit.

Examples

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