A wall or partition dividing a space, especially the wall of cartilage and bone dividing the two sides of the nose.
From Latin 'septum,' meaning a partition or fence, derived from 'saepire' (to fence or enclose). Used in anatomy for any dividing wall.
Most people are born with a slightly deviated septum—your nasal wall probably isn't perfectly straight—and surgeons can repair severely deviated ones that block breathing, though many people live their whole lives never noticing theirs isn't perfectly centered.
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