protophloem

[ proh-tuh-floh-em ]

noun

, Botany.

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

protophloem

/ prō′tə-flō′ĕm′ /

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

Word History and Origins

Origin of protophloem¹

First recorded in 1880–85; proto- + phloem