A septum that divides a multilocular ovary. [source: POC:curators]
Comment
Found in species with syncarpous gynoecia (fused carpels). An ovary septum is derived from the fused walls of two adjacent carpels, while a replum (PO:0005016) develops from early contact of placental tissue from opposite sides of the ovary. Annotations for Arabidopsis should go under replum, not under ovary septum.