The Collaborative International Dictionary of English v.0.48:

Usurer \U"su*rer\, n. [F. usurier, LL. usurarius. See Usury,
   and cf. Usurarious.]
   [1913 Webster]
   1. One who lends money and takes interest for it; a money
      lender. [Obs.]
      [1913 Webster]

            If thou lend money to any of my people that is poor
            by thee, thou shalt not be to him as a usurer,
            neither shalt thou lay upon him usury. --Ex. xxii.
                                                  25.
      [1913 Webster]

   2. One who lends money at a rate of interest beyond that
      established by law; one who exacts an exorbitant rate of
      interest for the use of money.
      [1913 Webster]

            He was wont to call me usurer.        --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

usurer
    n 1: someone who lends money at excessive rates of interest
         [syn: usurer, loan shark, moneylender, shylock]