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