November 25, 2022

What’s the Plural of Appendix? Appendixes or Appendices?

Appendixes is the plural of appendix when referring to anatomy. Appendices is plural in reference to a book or document.

Elk (not to be confused with moose and deer, though they all belong to the same Cervid family) is elk or elks, as a plural noun.

The plural of index (a Latin noun) is indexes or indices, though indices is the original, Latin plural form.

Singular nouns that end in -o (like mango) normally add s/es to show a plural, like mangos or mangoes.

Memorandum, which comes from Latin, is singular. Memoranda is plural for memorandum.

Singular nouns that end in -o normally take on s or es as a plural, like potato/potatoes (and tomato/tomatoes).

Singular nouns, like tomato, that end in -o often take on s/es as a plural: tomato/tomatoes (or potato/potatoes).