deltidium

noun

del·​tid·​i·​um

plural deltidia

-dēə

1

: a plate partly or wholly closing the delthyrium of certain brachiopods

called also pseudodeltidium

2

: a pair of plates not homologous with the pseudodeltidium that performs the same function in other brachiopods

called also deltidial plates

Word History

Etymology

New Latin, from Greek delta + New Latin -idium

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