From ZooTerms (Dictionary of Invertebrate Zoology)
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dissepiment (noun; plural dissepiments; Latin dissaepire, to separate): 1. A partitioning wall; a septum.

2. (Arthropoda: Insecta) a. The septa of an embryo, separating the coelom-sacs. b. The enclosing membrane of an obtect pupa.

3. (Cnidaria: Anthozoa) A transverse calcareous plate or partition between the radiating septa of coral.

4. (Sipuncula) A series of peritoneal tissue situated transversely across the coelom.