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