truncheon
Concise Oxford English Dictionary © 2008 Oxford University Press:
truncheon /ˈtrʌn(t)ʃ(ə)n/
▶noun chiefly Brit.
- 1 a short thick stick carried as a weapon by a police officer.
- 2 a staff or baton acting as a symbol of authority, especially that used by the Earl Marshal.
– origin ME (denoting a piece broken off, also a cudgel): from OFr. tronchon ‘stump’, based on L. truncus ‘trunk’.
'truncheon' also found in these Oxford entries:

