The Collaborative International Dictionary of English v.0.48:

Coenoecium \C[oe]*n[oe]"ci*um\ (? or ?), n. [NL., fr. Gr.
   koino`s common + o'i^kos house.] (Zool.)
   The common tissue which unites the various zooids of a
   bryozoan.
   [1913 Webster]