Sep"tum (?), n.; pl. Septa (#). [L. septum, saeptum, an inclosure, hedge, fence, fr. sepire, saepire, to hedge in, inclose.]
A wall separating two cavities; a partition; as, the nasal septum.
A partition that separates the cells of a fruit.
3. Zool. (a)
One of the radial calcareous plates of a coral.
One of the transverse partitions dividing the shell of a mollusk, or of a rhizopod, into several chambers. See Illust. under Nautilus.
One of the transverse partitions dividing the body cavity of an annelid.
© Webster 1913.