Английский разговорный словарь (основной) - septum
Septum
septum
ˈseptəm n. (pl. septa) Anat., Bot., & Zool. a partitionsuch as thatbetweenthe nostrils or the chambers of a poppy-fruit or of a shell. [L s(a)eptum f. saepire saeptenclose f. saepes hedge]