Of course, I can definitely help you out with this one. The plural form of appendix is "appendices" (pronounced "uh-pen-duh-sees").
Think of it like this: just as one index refers to one list, one appendix refers to one additional section at the end of a book or document. And just as multiple indices would be referred to as "indexes," multiple appendices are referred to as "appendices."
So, now you know that the next time you are writing a paper or book and need to refer to more than one appendix, you should use the word "appendices."
I hope that helps! If you have any more language-related questions, feel free to ask.
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