Source : Webster's Revised Unabridged Dictionary (1913)

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.

Siphonia \Si*pho"ni*a\, n. [NL.] (Bot.)
   A former name for a euphorbiaceous genus ({Hevea}) of South
   American trees, the principal source of caoutchouc.