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See more synonyms for protophloem on Thesaurus.com
noun Botany.
  1. 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. 2018

protophloem in Science


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