What's the plural form of phosphatidyl? Here's the word you're looking for.
Answer
The noun phosphatidyl can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be phosphatidyl.
However, in more specific contexts, the plural form can also be phosphatidyls e.g. in reference to various types of phosphatidyls
or a collection of phosphatidyls.
Examples
I have observed favorable clinical results from oral glyceryl phosphoryl choline and phosphatidyl choline liquid.