Septum

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Septum

(n.) A wall separating two cavities; a partition; as, the nasal septum.
(n.) A partition that separates the cells of a fruit.
(n.) One of the radial calcareous plates of a coral.
(n.) One of the transverse partitions dividing the shell of a mollusk, or of a rhizopod, into several chambers. See Illust. under Nautilus.
(n.) One of the transverse partitions dividing the body cavity of an annelid.