The Collaborative International Dictionary of English v.0.48:

Zoocytium \Zo`o*cy"ti*um\, n.; pl. Zoocytia. [NL., fr. Gr.
   zw^,on an animal + ? a hollow vessel.] (Zool.)
   The common support, often branched, of certain species of
   social Infusoria.
   [1913 Webster]