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four-hundred-day clock

[ fawr-huhn-druhd-dey, fohr- ]
/ ˈfɔrˌhʌn drədˈdeɪ, ˈfoʊr- /
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noun
a clock that needs to be wound once a year, having the works exposed under a glass dome and utilizing a torsion pendulum.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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