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14th century, in the meaning defined above
Middle English thille, perhaps from Old English, plank; akin to Old English thel board, Old High German dili, and probably to Latin tellus earth
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“Thill.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thill. Accessed 29 May. 2020.
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