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