The Collaborative International Dictionary of English v.0.48:

thaumaturgus \thau`ma*tur"gus\ (th[add]`m[.a]*t[^u]r"g[u^]s), n.
   [NL., from Gr. qaymatourgo`s wonder-working; qay^ma a wonder
   + 'e`rgon work.]
   A miracle worker; -- a title given by the Roman Catholics to
   some saints.
   [1913 Webster]