D / dissaeptum
noun

dissaeptum

gen. dissaepti · gender neuter · decl. 2nd
a barrier; partition
a barrier, partition: saxea domorum, Lucr. 6, 951; so too of the diaphragm: quod ventrem et cetera intestina secernit, Macr. Somn. Scip. 1, 6, § 77.