septum pellucidum

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septum pel·lu·ci·dum

 (pə-lo͞o′sĭ-dəm)
n. pl. septa pel·lu·ci·da (-də)
A thin membrane of nervous tissue that forms the medial wall of the lateral ventricles in the brain.

[New Latin sēptum pellūcidum : sēptum, septum + Latin pellūcidum, neuter of pellūcidus, transparent.]