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