caecum
From ZooTerms (Dictionary of Invertebrate Zoology)
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.
