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