The Collaborative International Dictionary of English v.0.48:

Numismatology \Nu*mis`ma*tol"o*gy\, n. [L. numisma, -atis +
   -logy.]
   The science which treats of coins and medals, in their
   relation to history; numismatics.
   [1913 Webster]

WordNet (r) 3.0 (2006):

numismatology
    n 1: the collection and study of money (and coins in particular)
         [syn: numismatics, numismatology, coin collecting,
         coin collection]