Septum

n. thin membrane that serves to divide two bodily cavities or tissues (Biology)

A septum (Latin: something that encloses; plural Septa) is a partition separating two cavities or spaces. Examples include:Nasal septum: the cartilage wall separating the nostrils of the human nose.Often deviated or perforated through physical injury or cocaine abuse.Cephalopod Septa: walls between each chamber, or siphuncle, in shells of nautiloids, ammonites, and belemnites; i.e. cephalopods that retain an external shell.The wall dividing the right side of the heart from the left side. Fungi produce septa to partition filamentous hyphae into discrete cells.
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Septum /sep·tum/ pl. sep´ta [L.] a dividing wall or partition. alveolar septum interalveolar s. [more]Septum - Community and Resources

Noun
1. (anatomy) a dividing partition between two tissues or cavities
(hypernym) body part
(hyponym) nasal septum
(classification) anatomy, general anatomy
2. a partition or wall especially in an ovary
(hypernym) plant organ

n. septum, thin membrane that serves to divide two bodily cavities or tissues (Biology)