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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

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History and Etymology for siphonium

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

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