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Meaning of four-hundred-day clock

four'-hun•dred-day' clock'

Pronunciation: (fôr'hun"drud-dā', fōr'-), [key]
  1. a clock that needs to be wound once a year, having the works exposed under a glass dome and utilizing a torsion pendulum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.