ship's bell

Noun
  1. (nautical) each of the eight half-hour units of nautical time signaled by strokes of a ship's bell;
    Eight bells signals 4:00, 8:00, or 12:00 o'clock, either a.m. or p.m. (synset 115252389)
    referred to in: navigation, sailing, seafaring - the work of a sailor
    is a type of: time unit, unit of time - a unit for measuring time periods
    same as: bell

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