septum

noun10

1. •
   A wall separating two cavities; a partition.
2. •
   Either of the two walls that separate the atria or ventricles of the heart into left and right chambers.
3. •
   A partition that separates the cells of a fruit.
4. •
   A partition that separates the cells of a (septated) fungus.
5. •
   One of the radial calcareous plates of a coral.
6. •
   One of the transverse partitions dividing the shell of a mollusk, or of a rhizopod, into several chambers.
7. •
   One of the transverse partitions dividing the body cavity of an annelid.
8. •
   One of the walls dividing two holes in a parallel-hole collimator
9. •
   Ellipsis of nasal septum (“the cartilaginous center wall of the nose separating the two nostrils”).

   • Deviated septum, a shift from the midline that commonly occurs in normal growth, is present in most adults. — 2002
10. •
    (informal) Ellipsis of septum ring or septum piercing.

    • Look, I got a new septum!