The Collaborative International Dictionary
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.
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.
Wiktionary
n. (plural of siphonium English)
Wikipedia
Siphonia ("Siphon") is a genus of extinct hallirhoid demosponges of the Upper Cretaceous, from about 125 to 66 million years ago. They lived in the Western Tethys Ocean, in what is now Europe.
Usage examples of "siphonia".
Of the various trees from which India-rubber is procured, such as the Ficus prinoides, the Castilioa elastica, the Cecropia peltata, the Callophora utilis, the Cameraria latifolia, and especially the Siphonia elastica, all of which abound in the provinces of South America, not a single specimen was to be seen.