usury (n.) Look up usury at Dictionary.com
c.1300, "practice of lending money at interest," later, at excessive rates of interest, from Medieval Latin usuria, alteration of Latin usura "payment for the use of money, interest," literally "a usage, use, enjoyment," from usus, from stem of uti (see use (v.)). From mid-15c. as "premium paid for the use of money, interest," especially "exorbitant interest."