Meaning of “appendix” - Learner’s Dictionary

appendix

noun [ C ] us uk /əˈpendɪks/
BODY plural appendixes

a small tube-shaped part inside the body below the stomach, attached to the large intestine

BOOK plural appendices

a separate part at the end of a book, article, etc that contains extra information

(Definition of “appendix” from the Cambridge Learner’s Dictionary © Cambridge University Press)