Definition of patrols:
(n) :
(law enforcement) The largest division of officers within a police department or sheriff's office, whose assignment is to patrol and respond to calls for service.
(n) :
Any perambulation of a particular line or district to guard it; also, the people thus guarding.
(v) :
(intransitive) To go the rounds along a chain of sentinels; to traverse a police district or beat.
(v) :
(transitive) To go the rounds of, as a sentry, guard, or policeman
(n) :
(military) The guards who go the rounds for observation; a detachment whose duty it is to patrol.
(n) :
(military) A going of the rounds along the chain of sentinels and between the posts, by a guard, usually consisting of three or four men, to insure greater security from attacks on the outposts.