The correct plural of appendix depends on the circumstances.
If you are talking about the text at the end of a book or article, either the plural appendices or appendixes is correct.
If you are talking about the organ in the body, appendixes is the only plural.
The possessive form of the word "dictionary" is "dictionary's."
There are two accepted plural forms of the noun 'appendix', appendixes and appendices.The plural possessive forms are appendixes' and appendices'.Example: The appendixes' resources in these texts will help with your research.
The singular possessive form is word's, for example the word's definition.
possessive form of the word glass: glass'
possessive form of the word Congress: Congress'
possessive form for the word holders: holders'
possessive form of the word Cathi: Cathi's
The possessive form of the word fairy is fairy's.
the possessive form of the word Cathie: Cathie's
The possessive form is Lindbergh's.
The possessive form is weaver's.
The possessive form for the interrogative pronoun who is whose.