Protoxylem
noun, Botany.
1.
the part of the primary xylem that develops first, consisting of narrow, thin-walled cells.
noun
1.
the first-formed xylem tissue, consisting of extensible thin-walled cells thickened with rings or spirals of lignin Compare metaxylem
protoxylem
(prō’tə-zī’ləm)
The first formed xylem that differentiates from the procambium.
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