Etymology
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septum (n.)

"wall separating two cavities," especially "the partition between the nostrils," 1690s, Modern Latin, from Latin saeptum "a fence, enclosure, partition," from neuter past participle of saepire "to hedge in," from saepes"a hedge, a fence," which de Vaan suggests is from a PIE *seh-i- "to tie." Related: Septal.

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Definitions of septum

septum (n.)
(anatomy) a dividing partition between two tissues or cavities;
septum (n.)
a partition or wall especially in an ovary;
From wordnet.princeton.edu