Stemming from Old French and related to the word pilfer,pelf is filthy lucre or ill-gotten riches. I found it the other day when someone worked it into a limerick.
Naturally, I couldn't wait to try that myself:
A Christian man, godly and selfless,
Who was powerful, pious, and pelfless,
Lost the fans on his side
On the day that he tried
To make all of our Christmases elfless.