septum PlantSystematics_image_archive:1597 dissepiment (broad) 隔壁 (Japanese, exact) FNA:978c1c40-4dee-4bb1-99f6-b2360d1b77b4 A collective organ part structure composed of two or more layers of various tissues that is a partition that divides a cavity formed by the fusion of two or more organs. PO:0000030 plant_anatomy PO_GIT:277 A septum is formed by the fusion of the walls of two adjacent organs (ovary walls or anther walls), for example, the partition between two sections of an orange, seen in cross-section. septo (Spanish, exact) septa (exact, plural) collective organ part structure