SINCE 1828
protoxylem
noun
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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