Definitions

from the GNU version of the Collaborative International Dictionary of English

  • n. An extinct genus of large, fossil, bivalve shells, allied to the mussels. The genus is characteristic of the Cretaceous period.

from The Century Dictionary and Cyclopedia

  • n. A genus of fossil bivalve mollusks of the family Aviculid√¶, characteristic of the Cretaceous period.

Etymologies

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