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Septum

A septum, in general, is a wall separating two cavities. The word is Latin and literally means "something that encloses". The term is most commonly used in anatomy and biology:

the septum nasi, or simply septum, is the cartilage wall separating the two nostrils
the interventricular septum is the wall separating the two halves of the heart
the septum is also a dividing structure in the brain

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