noun.
an observationtower, in which a lookout keeps watch over prisoners, or looks out for fires etc
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
an observation tower for a lookout to watch over prisoners or watch for fires or enemies
Word Usage
"He eventually videotapes what he describes as a watchtower, dozens of large tents, an old ambulance, and what he says are picnic tables and games on the other side of a six-foot chain-link fence topped with razor wire."