What's the plural form of methylnaphthalene? Here's the word you're looking for.
Answer
The noun methylnaphthalene can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be methylnaphthalene.
However, in more specific contexts, the plural form can also be methylnaphthalenes e.g. in reference to various types of methylnaphthalenes
or a collection of methylnaphthalenes.
Examples
In 2010 Kellogg Company recalled 28 million boxes of cereal because of elevated levels of methylnaphthalene that leached from the coated paper lining the boxes.