patroller

from WordNet (r) 3.0 (2006)
patroller
    n 1: someone on patrol duty; an individual or a member of a
         group that patrols an area
from The Collaborative International Dictionary of English v.0.48
patroller \patroller\ n.
   An individual or a member of a group that patrols an area.
   [WordNet 1.5]
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