What is 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 called?

heraldry — 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. (Webster's 1913.)