Dictionary
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
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First Known Use of PROTOXYLEM
1887
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