What is the prefix of expensive new word?

There is no word "expensive new" in the English language. It's likely you're thinking of a different word or phrase.

Could you please clarify what you mean by "expensive new word"?

* Are you looking for a word that means "expensive and new"? In this case, you could use words like "pricy," "costly," "luxurious," "high-end," "cutting-edge," or "state-of-the-art".

* Are you trying to identify a prefix used in a specific word related to expense or newness? If so, please provide the word.

Once you clarify your question, I can help you find the answer!