appendix
US /əˈpen.dɪks/
UK /əˈpen.dɪks/

1.
a tube-shaped sac attached to the large intestine of humans and some other mammals, having no known function.
:
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The surgeon removed his inflamed appendix.
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An inflamed appendix can cause severe abdominal pain.
2.
a section or table of additional matter at the end of a book or document.
:
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Please refer to Appendix A for more details.
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The book includes an appendix with a glossary of terms.