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