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