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