The Collaborative International Dictionary of English v.0.48:
Tipstaff \Tip"staff`\, n.; pl. Tipstaff. 1. A staff tipped with metal. --Bacon. [1913 Webster] 2. An officer who bears a staff tipped with metal; a constable. --Macaulay. [1913 Webster]WordNet (r) 3.0 (2006):
tipstaff n 1: staff with a metal tip carried as a sign of office by e.g. a bailiff or constable