Definitions

from The Century Dictionary.

  • noun 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.

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

  • noun (Zoöl.) A genus of cretaceous fossil shells allied to the oyster.

Etymologies

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