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