protophloem

[ proh-tuh-floh-em ]
/ ˌproʊ təˈfloʊ ɛm /

noun Botany.

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

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Origin of protophloem

First recorded in 1880–85; proto- + phloem
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for protophloem

protophloem
[ prō′tə-flōĕm′ ]

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