The Collaborative International Dictionary of English v.0.48:

Bracer \Bra"cer\, n.
   1. That which braces, binds, or makes firm; a band or
      bandage.
      [1913 Webster]

   2. A covering to protect the arm of the bowman from the
      vibration of the string; also, a brassart. --Chaucer.
      [1913 Webster]

   3. A medicine, as an astringent or a tonic, which gives
      tension or tone to any part of the body. --Johnson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bracer
    n 1: a protective covering for the wrist or arm that is used in
         archery and fencing and other sports [syn: bracer,
         armguard]
    2: a tonic or restorative (especially a drink of liquor) [syn:
       bracer, pick-me-up]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "bracer":
   advocate, alpenstock, analeptic, arm, athletic supporter, back,
   backbone, backing, bandeau, bearer, bra, brace, bracing, bracket,
   brassiere, buttress, cane, carrier, cervix, cordial, corset, crook,
   crutch, enlivenment, exhilaration, foundation garment, fulcrum,
   girdle, guy, guywire, invigoration, jock, jockstrap, mainstay,
   maintainer, mast, neck, pick-me-up, pickup, prop, reanimation,
   recreation, refection, refresher, refreshing, refreshment, regale,
   regalement, reinforce, reinforcement, reinforcer, reinvigoration,
   renewal, rest, resting place, restorative, revival, reviver,
   revivescence, revivescency, revivification, rigging, roborant,
   shoulder, shroud, spine, sprit, staff, standing rigging, stave,
   stay, stick, stiffener, stimulation, strengthener, support,
   supporter, sustainer, tonic, upholder, vitamin shot, vivification,
   walking stick