Pycnodonta

noun
Pyc·no·don·ta | \ˌpiknəˈdäntə\

Definition of Pycnodonta 

: a genus of large tropical oysters having strongly scalloped shells with crinkled ridges on each side of the hinge and occurring chiefly on coral reefs

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History and Etymology for Pycnodonta

New Latin, from pycn- + -odonta

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