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