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What is the plural of sinusitis?

What's the plural form of sinusitis? Here's the word you're looking for.

Answer

The noun sinusitis can be countable or uncountable.

In more general, commonly used, contexts, the plural form will also be sinusitis.

However, in more specific contexts, the plural form can also be sinusitides e.g. in reference to various types of sinusitides or a collection of sinusitides.

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Examples
A magnetic resonance image demonstrated sinusitis involving mainly the right maxillary, ethmoid, and frontal sinuses.
This is mainly due to hunting and to diseases such as pneumonia, scabies and sinusitis caught from introduced sheep.
The fungi can also worsen the symptoms of asthma and cause allergic sinusitis.
In such outbreaks, pneumococcal infections have included sepsis, meningitis, purulent conjunctivitis, recurrent otitis media and sinusitis.
In acute bacterial sinusitis, the nose merely acts as a conduit for eliminating purulent secretions produced in the sinuses.
By suppressing the fever these children end up with chronic glue ear, sinusitis or chest catarrh.

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