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