Prionodesmacea
plural noun
Pri·ono·des·ma·cea
| \ ˌprīə(ˌ)nōˌdezˈmāsēə; prīˌänō-, prīˌōnō- \
Definition of Prionodesmacea
in some classifications
: a division of Lamellibranchia comprising comparatively primitive bivalve mollusks that typically have the hinge prionodont and being approximately equal to the combined orders Protobranchia and Filibranchia
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Merriam-Webster unabridged
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