protoxylem

[ proh-tuh-zahy-luhm, -lem ]

noun

, Botany.

1. the part of the primary xylem that develops first, consisting of narrow, thin-walled cells.

protoxylem

/ ˌprəʊtəˈzaɪləm /

noun

1. See metaxylem
   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 /

1. The first formed xylem that differentiates from the procambium.

Word History and Origins

Origin of protoxylem¹

First recorded in 1895–1900; proto- + xylem