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