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