What is "siphonium"

Siphonium \Si*pho"ni*um\, n.; pl. Siphonia. [NL., from Gr. ????, dim. of ????. See Siphon.] (Anat.) A bony tube which, in some birds, connects the tympanium with the air chambers of the articular piece of the mandible.

n. (context anatomy English) A bony tube which, in some birds, connects the tympanium with the air chambers of the articular piece of the mandible.

Siphonium is a genus of sea snails, marine gastropod mollusks in the family Vermetidae, the worm snails or worm shells.