1857, in the meaning defined above
New Latin protonemat-, protonema, from prot- + Greek nēma thread — more at nemat-
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Cite this Entry
“Protonema.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protonema. Accessed 26 Jun. 2022.
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Britannica.com: Encyclopedia article about protonema
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