serjeant-at-arms
Concise Oxford English Dictionary © 2008 Oxford University Press:
serjeant-at-arms (also sergeant-at-arms)
▶noun (pl. serjeants-at-arms)
- 1 an official of a legislative assembly whose duties include maintaining order and security.
- 2 historical a knight or armed officer in the service of the monarch or a lord.
'serjeant-at-arms' also found in these Oxford entries:

