Middle English Hillarimesse, from St. Hilary †ab a.d. 367 bishop of Poitiers + Middle English messe mass
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Archaic Words We Know from Christmas...
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“Hilarymas.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Hilarymas. Accessed 22 Feb. 2024.
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