delthyrium

noun
del·​thy·​ri·​um
plural delthyria\ -​rēə \

Definition of delthyrium

: the opening between the beak and the hinge through which the pedicle of certain brachiopods extends

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History and Etymology for delthyrium

New Latin, probably irregular from Greek dēlos clear, visible, evident + thyrion little door, diminutive of thyra door

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