petty officer
Concise Oxford English Dictionary © 2008 Oxford University Press:
petty officer
▶noun a rank of non-commissioned officer in the navy, above leading seaman or seaman and below chief petty officer.
'petty officer' also found in these Oxford entries:
chief petty officer
- corporal
- coxswain
- CPO
- leading seaman
- PO
- quartermaster
- seaman
- yeoman

