appendixListen to pronunciation(uh-PEN-dix)A small, fingerlike pouch that sticks out from the cecum (the first part of the large intestine near the end of the small intestine).Enlarge this image in new windowThe appendix is a small, fingerlike pouch that is attached to the end of the colon (large intestine).Search NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#