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I couldn't find out this word in any dictionary.

I couldn't find out this word in any dictionaries.

Are both setnences correct?
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User_garyI couldn't find out this word in any dictionary.

I couldn't find out this word in any dictionaries

Are both setnences correct?
Neither: I couldn't find this word/I couldn't trace this word...

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Comments  
Students: We have free audio pronunciation exercises.
Thank you Feebs11.

So I think I can put either plural or singular noun after the word "any". Am I right?

e.g. I don't have any pen;

I don't have any pens.
You can - but consider the context of the sentence before you do so.

I don't have any pen to sign this with.
I don't have any pens [in my possession]