What is an example of the prefix nacro?

There is no prefix "nacro" in the English language. It's possible you've misheard or misspelled the prefix you are thinking of.

Could you please clarify or provide more context? For example, are you trying to recall a specific word that starts with "nacro"? Or are you looking for a word that uses a prefix similar to "nacro"?

I'm here to help you find the right word!