From ZooTerms (Dictionary of Invertebrate Zoology)
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caecum also cecum (noun; plural caeca; Latin caecus, blind): 1. A pouch or saclike cavity extending from the alimentary canal with an opening at only one end.

2. (Brachiopoda) Evagination of the outer epithelium projecting into the endopuncta of the shell; pallial caecum; mantle papilla.

3. (Echiura) When present, a blind pouch arising from the posterior (precloacal) region of the intestine; function unknown.

4. (Sipuncula) see rectal caecum.