What's the plural form of circumnutation? Here's the word you're looking for.
Answer
The noun circumnutation can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be circumnutation.
However, in more specific contexts, the plural form can also be circumnutations e.g. in reference to various types of circumnutations
or a collection of circumnutations.
Examples
The bare fact that circumnutation is a general property of plants is not generally rejected.
It is sufficient for my purpose to point out that Darwin's explanation of circumnutation is not universally accepted.