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