protoxylem

3 ENTRIES FOUND:

pro·to·xy·lem

noun \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

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