The Collaborative International Dictionary of English v.0.48:

Numismatics \Nu`mis*mat"ics\, n. [Cf. F. numismatique.]
   The science of coins and medals.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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