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.
GNU Webster's 1913
- n. (Paleon.) The petrified fruit of the Chara hispida, a species of stonewort. See stonewort.
- Ancient Greek circle, ring + fruit. (Wiktionary)
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