1. (n.) A wall separating two cavities; a partition; as, the nasal septum.

2. (n.) A partition that separates the cells of a fruit.

3. (n.) One of the radial calcareous plates of a coral.

4. (n.) One of the transverse partitions dividing the shell of a mollusk, or of a rhizopod, into several chambers.

5. (n.) One of the transverse partitions dividing the body cavity of an annelid.

barrier brattice buffer buffer state bulkhead bumper cloison collision mat cushion diaphragm dissepiment dividing line dividing wall division fender interseptum mat midriff midsection pad panel paries partition party wall property line separation septulum shock pad wall