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