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