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noun (plural appendixes or appendices /-siːz/)
- 1 Anatomy a tube-shaped sac attached to and opening into the lower end of the large intestine in humans and some other mammals. In humans the appendix is small and has no known function, but in rabbits, hares, and some other herbivores it is involved in the digestion of cellulose: I’m merely standing in while Stella is having her appendix outAlso called vermiform appendix.
Appendix typically has the plural appendixes in the anatomical sense, and appendices when referring to a part of a book or document.