Merriam-Webster Collegiate Dictionary - usury

 noun  (plural -ries)  Etymology: Middle English usurie, from Anglo-French, from Medieval Latin usuria, alteration of Latin usura, from usus, past participle of uti to use  Date: 14th century  1. archaic interest  2. the lending of money with an interest charge for its use; especially the lending of money at exorbitant interest rates  3. an unconscionable or exorbitant rate or amount of interest; specifically interest in excess of a legal rate charged to a borrower for the use of money