Siphonium
Pronunciation : Si*pho"ni*um
Part of Speech : n.;
Etymology : [NL., from Gr. Siphon.] (Anat.)
Definition : Defn: A bony tube which, in some birds, connects the tympanium with the air chambers of the articular piece of the mandible.
pl. Siphonia.
Source : Webster's Unabridged Dictionary, 1913