Pronunciation: (u-pen'diks),[key] —n., —pl.-dix•es, -di•cesPronunciation: (-du-sēz").[key] 1. supplementary material at the end of a book, article, document, or other text, usually of an explanatory, statistical, or bibliographic nature.
2. an appendage.
3. Anat. a. a process or projection.
b. See vermiform appendix. 4. Aeron.the short tube at the bottom of a balloon bag, by which the intake and release of buoyant gas is controlled.