What's the plural form of polyarteritis? Here's the word you're looking for.
Answer
The noun polyarteritis can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be polyarteritis.
However, in more specific contexts, the plural form can also be polyarteritides e.g. in reference to various types of polyarteritides
or a collection of polyarteritides.
