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protoxylem

American  
[proh-tuh-zahy-luhm, -lem] / ˌproʊ təˈzaɪ ləm, -lɛm /

noun

Botany.

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

protoxylem British  
/ 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
protoxylem Scientific  
/ prō′tə-zī′ləm /

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

Etymology

Origin of protoxylem

First recorded in 1895–1900; proto- + xylem

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Cortex; en. endodermis; pe. pericycle; ph. phloëm; pr. protoxylem; xy. xylem vessel.

From A Handbook of Some South Indian Grasses by Rangachari, K.

Finally, in the pinnae of the frond the centrifugal xylem may disappear, the protoxylem being now exarch in position and abutting on the phloem.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" by Various

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.