The Collaborative International Dictionary
Zoodendrium
Zoodendrium \Zo`["o]*den"dri*um\, n.; pl. Zo["o]dendria. [NL., fr. Gr. zw^,on an animal + ? a tree.] (Zo["o]l.) The branched, and often treelike, support of the colonies of certain Infusoria.
Wiktionary
zoodendrium
n. (alternative spelling of zoödendrium English)