Is" Nor" used Incorrectly in this Instance?

I'm having trouble finding the rule of how and when to use "nor" when the sentence is negated by the noun "nothing."

For instance: "Nothing in his letter to you was meant nor intended as cynicism."

"Nor" in this example seems wrong, for the negative in 'nothing' is only confined to its own clause. (So I've been told, anyway.) There is only one clause in this sentence, so I'm thinking that "or" is correct and "nor" is incorrect in my example, as "nothing" negates both "meant" and "implied" in the one clause. Am I right?

Also, can someone provide me with an accurate rule for usage?

Thank you.