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