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siphonium

noun
si·​pho·​ni·​um | \ sīˈfōnēəm\
plural siphonia\ -​ēə \

Definition of siphonium

: a bony tube in some birds connecting the tympanum with the air chambers of the articular piece of the mandible

History and Etymology for siphonium

New Latin, from Greek siphōnion, diminutive of siphōn tube, siphon

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