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