The Collaborative International Dictionary of English v.0.48:

Heraldry \Her"ald*ry\, n.
   1. The art or office of a herald; the art, practice, or
      science of recording genealogies, and blazoning arms or
      ensigns armorial; also, of marshaling cavalcades,
      processions, and public ceremonies.
      [1913 Webster]

   2. A coat of arms or some other heraldic device or collection
      of heraldic symbols.
      [PJC]

WordNet (r) 3.0 (2006):

heraldry
    n 1: the study and classification of armorial bearings and the
         tracing of genealogies
    2: emblem indicating the right of a person to bear arms