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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

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.

Source: Webster's Revised Unabridged Dictionary (1913)