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