Definition of septum noun from the Oxford Advanced American Dictionary

 

septum

 noun
noun
NAmE//ˈsɛptəm//
 
(pl. septa
NAmE//ˈsɛptə//
 
)
(anatomy)
 
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a thin part that separates two hollow areas, for example the part of the nose between the nostrils
See the Oxford Advanced Learner's Dictionary entry: septum