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