The Collaborative International Dictionary of English v.0.48:

macebearer \macebearer\, mace bearer \mace bearer\n.
   an official who carries the mace of office before persons in
   authority.

   Syn: mace, macer.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

macebearer
    n 1: an official who carries a mace of office [syn:
         macebearer, mace, macer]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

MACE-BEARER, Eng. law. An officer attending the court of session.