protoxylem

[ proh-tuh-zahy-luh m, -lem ]
/ ˌproʊ təˈzaɪ ləm, -lɛm /

noun Botany.

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

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Origin of protoxylem

First recorded in 1895–1900; proto- + xylem
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for protoxylem

protoxylem
/ (ˌprəʊtəˈzaɪləm) /

noun

the first-formed xylem tissue, consisting of extensible thin-walled cells thickened with rings or spirals of ligninCompare metaxylem
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for protoxylem

protoxylem
[ prō′tə-zīləm ]

The first formed xylem that differentiates from the procambium.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.