• In book design, an appendix is a reference section at the end of a book (see Addendum#Books)
• In anatomy, a section at the end of an organ; in particular the:
• Vermiform appendix (often referred to as simply the "appendix"), a part of the human digestive system.
• Right auricular appendix, a conical pouch on the right atrium of the heart.
• Left auricular appendix, a conical pouch on the left atrium of the heart.
• Appendix of the epididymis, a detached efferent duct of the epididymis.
• Appendix testis, a vestigial remnant of the Müllerian duct.
• Epiploic appendix, one of several small pouches of fat on the peritoneum along the colon and rectum.
• Fibrous appendix of the liver, a band on the left of the liver.
• Appendix of the laryngeal ventricle, a sac that extends from the laryngeal ventricle.
• Mesoappendix, the portion of the mesentery that connects the ileum to the vermiform appendix.
• In law, an appendix is an addition or addendum to a contract; see Addendum#Contracts

See also

• irregular English plurals — the word "appendix" has irregular plural forms (appendixes vs. appendices)

References

• Richard sackin on the Plural of Appendix - Appendixes vs. Appendices