1875, in the meaning defined above
back-formation from the New Latin taxon Myxomycetes, designating slime molds, from myxo- myxo- + -mycetes, borrowed from Greek mýkētes, plural of mýkēs "mushroom, fungus" — more at myc-
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“Myxomycete.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/myxomycete. Accessed 23 Sep. 2021.
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