SINCE 1828
deltidium
noun
del·tid·i·um
plural deltidia\ -dēə \
Definition of deltidium
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
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Merriam-Webster unabridged
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