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protoxylem

[proh-tuh-zahy-luh m, -lem] /ˌproʊ təˈzaɪ ləm, -lɛm/
noun, Botany
1.
the part of the primary xylem that develops first, consisting of narrow, thin-walled cells.
Origin
1895-1900
1895-1900; proto- + xylem
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for protoxylem
  • During internode elongation only protoxylem vessels stained for the presence of lignin.
British Dictionary definitions for protoxylem

protoxylem

/ˌprəʊtəˈzaɪləm/
noun
1.
the first-formed xylem tissue, consisting of extensible thin-walled cells thickened with rings or spirals of lignin Compare 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
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protoxylem in Science
protoxylem
  (prō'tə-zī'ləm)   
The first formed xylem that differentiates from the procambium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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