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