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sweep-second

noun
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Definition of sweep-second

: a second hand on a timepiece mounted concentrically with the other hands and read on the minute dial also : a timepiece with such a second hand

— called also center-second

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“Sweep-second.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sweep-second. Accessed 12 Jun. 2021.

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