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protoxylem

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

Definition of protoxylem

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



1887

First Known Use of protoxylem

1887


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