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