Appendix

pl. Appendixes, Appendices

1. Something appended or added; an appendage, adjunct, or concomitant.

   Normandy became an appendix to England.

2. Any literary matter added to a book, but not necessarily essential to its completeness, and thus distinguished from supplement, which is intended to supply deficiencies and correct inaccuracies.
3. The vermiform appendix. (Anatomy)