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