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