pro·to·xy·lem
| \ ˌprō-tə-ˈzī-ləm
, -ˌlem \
, -ˌlem \
Definition of protoxylem
: the first-formed xylem developing from procambium and consisting of narrow cells with annular, spiral, or scalariform wall thickenings
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“Protoxylem.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protoxylem. Accessed 3 Jul. 2022.
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Time Traveler for protoxylem
The first known use of protoxylem was in 1887
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