| n. | 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. | (Zool.) The ectoderm of a sponge. |
| Noun | 1. | syncytium - a mass of cytoplasm containing several nuclei and enclosed in a membrane but no internal cell boundaries (as in muscle fibers) |