Definition of addendum circle
: a circle touching the outermost points of the teeth of a circular gear wheel — see pitch line
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“Addendum circle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/addendum%20circle. Accessed 28 May. 2022.
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Time Traveler for addendum circle
The first known use of addendum circle was in 1870
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