officiant

from WordNet (r) 3.0 (2006)

officiant
    n 1: a clergyman who officiates at a religious ceremony or
         service

from The Collaborative International Dictionary of English v.0.48

Officiant \Of*fi"ciant\, n. [L. officians, p. pr. See
   {Officiate}.] (Eccl.)
   The officer who officiates or performs an office, as the
   burial office. --Shipley.
   [1913 Webster]