The Collaborative International Dictionary of English v.0.48:
Watchman \Watch"man\, n.; pl. Watchmen.
1. One set to watch; a person who keeps guard; a guard; a
2. Specifically, one who guards a building, or the streets of
a city, by night.
Watchman beetle (Zool.), the European dor.
Watchman's clock, a watchman's detector in which the
apparatus for recording the times of visiting several
stations is contained within a single clock.
Watchman's detector, or Watchman's time detector, an
apparatus for recording the time when a watchman visits a
station on his rounds.
Watchman's rattle, an instrument having at the end of a
handle a revolving arm, which, by the action of a strong
spring upon cogs, produces, when in motion, a loud, harsh,