protophloem

protophloem

[proh-tuh-floh-em]
noun Botany.
the part of the primary phloem that develops first, consisting of narrow, thin-walled cells.

Origin:
1880–85; proto- + phloem

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
protophloem   (prō'tə-flō'ěm')  Pronunciation Key 
The first formed phloem that differentiates from the procambium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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