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elliptic gear

noun
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Definition of elliptic gear

: a change gear consisting of a pair of equal gear wheels which are elliptical in shape and each of which rotates around one of its foci

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“Elliptic gear.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/elliptic%20gear. Accessed 10 December 2019.

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