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