The Collaborative International Dictionary of English v.0.48:
Policeman \Po*lice"man\, n.; pl. Policemen. A member of a body of police; a constable. [1913 Webster]WordNet (r) 3.0 (2006):
policeman n 1: a member of a police force; "it was an accident, officer" [syn: policeman, police officer, officer]