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