term:

Usury

usury n

[Medieval Latin usuria interest, lending at exorbitant interest, alteration of Latin usura use, interest (i.e., sum paid for use of money), from usus use]
1 : the lending of money at exorbitant interest rates
;specif
: the crime of charging or contracting to charge an unlawfully high rate of interest
2 : a rate or amount of interest charged in usury compare legal interest at interest

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.