Synonyms for Ship's Bell (same or very similar meaning)
WordNet sense 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.):
bell
From the ODE community, based on WordNet
add/edit