protoxylem

noun
pro·​to·​xy·​lem | \ˌprō-tə-ˈzī-ləm, -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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