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