The Collaborative International Dictionary of English v.0.48:

Blazer \Blaz"er\, n.
   One who spreads reports or blazes matters abroad. "Blazers of
   crime." --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blazer \Blaz"er\, n.
   1. Anything that blazes or glows, as with heat or flame.
      [Webster 1913 Suppl.]

   2. A light jacket, usually of wool or silk and of a bright
      color, for wear at tennis, cricket, or other sport.
      [Webster 1913 Suppl.]

   3. The dish used when cooking directly over the flame of a
      chafing-dish lamp, or the coals of a brasier.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

blazer
    n 1: lightweight single-breasted jacket; often striped in the
         colors of a club or school [syn: blazer, sport jacket,
         sport coat, sports jacket, sports coat]