Watch·man n.; pl. Watchmen
 1. One set to watch; a person who keeps guard; a guard; a sentinel.
 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, rattling sound.

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