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