What's the plural form of cryoscopy? Here's the word you're looking for.
Answer
The noun cryoscopy can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be cryoscopy.
However, in more specific contexts, the plural form can also be cryoscopies e.g. in reference to various types of cryoscopies
or a collection of cryoscopies.
Examples
The most promising of the methods which have been devised are cryoscopy, the methylene-blue test, and the phloridzin test.
The method of cryoscopy is also of considerable service in forensic medicine.
