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15th century, in the meaning defined above
Late Latin immarcescibilis, from Latin in- in- entry 1 + Late Latin marcescibilis withering, from Latin marcescere to wither, fade away + -ibilis -ible
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“Immarcescible.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/immarcescible. Accessed 16 Aug. 2022.
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