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