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From the Editors at Merriam-Webster
7 Uncommonly Doubled Letters
7 Uncommonly Doubled Letters
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Last Updated
24 Feb 2020
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“Radius.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/radius. Accessed 2 Apr. 2020.
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Time Traveler for radius
The first known use of radius was in 1578
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