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From The Collaborative International Dictionary of English v.0.48:
Appendix \Ap*pen"dix\, n.; pl. E. Appendixes, L. Appendices. [L. appendix, -dicis, fr. appendere. See Append.] 1. Something appended or added; an appendage, adjunct, or concomitant. [1913 Webster] Normandy became an appendix to England. --Sir M. Hale. [1913 Webster] 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. [1913 Webster] 3. (Anatomy) The vermiform appendix. [Webster 1913 Suppl.] Syn: See Supplement. [1913 Webster]