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