\Syn*cy"ti*um\, n.; pl. {Syncitia}. [NL., from Gr. ?
together + ? a hollow vessel.]
1. (Biol.) Tissue in which the cell or partition walls are
   wholly wanting and the cell bodies fused together, so that
   the tissue consists of a continuous mass of protoplasm in
   which nuclei are imbedded, as in ordinary striped muscle.
2. (Zo["o]l.) The ectoderm of a sponge.