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