protoxylem

noun
pro·​to·​xy·​lem | \ ˌprō-tə-ˈzī-ləm How to pronounce protoxylem (audio) , -ˌlem \

Definition of protoxylem

: the first-formed xylem developing from procambium and consisting of narrow cells with annular, spiral, or scalariform wall thickenings

First Known Use of protoxylem

1887, in the meaning defined above

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The first known use of protoxylem was in 1887

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Cite this Entry

“Protoxylem.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protoxylem. Accessed 24 Feb. 2021.

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