Is watermelon countable or uncountable?
Suppose I have a sliced watermelon and I point to a piece of it and say it is a watermelon. Is watermelon countable here or uncountable? Is this sentence correct?
It is a watermelon.

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This field is for growing watermelon.
There are about two watermelon(s) per square meter.
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We cut each watermelon into 18 slices of watermelon.
Have a slice. Better yet have two slices (of watermelon).
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What is this stuff, sliced up on the plate?
It is watermelon.
It is watermelon slices.
It is slices of watermelon.
It is slices of a watermelon I bought earlier.
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Such a great spread. You seem to have thousands of slices of watermelon.
Yes, many watermelon(s) suffered to provide this treat.

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"I'd like that slice of watermelon, please."

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A watermelon refers to the whole fruit. When you cut it up you have watermelon or slices of watermelon. If you point to a slice of it you can call it 'watermelon', but not 'a watermelon'.