n. In human anatomy, the blind pouch or cul-de-sac which is the beginning of the colon, into which the ileum opens, and to which the vermiform appendage is attached.n. In zoology, any cæcal diverticulum or intestinal appendage ending in a cul-de-sac.n. [capitalized] [NL.] The typical genus of the family Cæcidæ.n. In starfishes, the bifurcated multilobular prolongations of the pyloric region of the stomach, the walls being glandular and secreting a digestive fluid.