Meaning of appendix

ap•pen•dix

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.
1. a process or projection.
2. Seevermiform appendix.
4. the short tube at the bottom of a balloon bag, by which the intake and release of buoyant gas is controlled.