Asking the definition of an unknown word

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Senior Member
Hi all,

When we're asking a word that we are not sure about its part of speech or whether it's countable or uncountable. How can we ask it?
Let's say I have no clues about the word "apple"

Should I ask " Do you know what an apple is?"
"Do you know what apples are?"
Or "Do you know what apple is?"

Could someone help me with this problem?

Thank you.
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