Definitions

from the GNU version of the Collaborative International Dictionary of English

  • n. A genus of cretaceous fossil shells allied to the oyster.

from The Century Dictionary and Cyclopedia

  • n. A genus of fossil oysters, of the family Ostrœidæ, notable for the great thickness of the shell and the inequality of the valves, the right one being very large with a prominent curved umbo.

Etymologies

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Examples

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