noun Botany.
the meristem from which vascular bundles are developed.
Also called provascular tissue.

1870–75; < Neo-Latin; see pro-1, cambium

procambial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
procambium (prəʊˈkæmbɪəm)
undifferentiated plant tissue, just behind the growing tip in stems and roots, that develops into conducting tissues
[C19: from pro-² + cambium]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
procambium   (prō-kām'bē-əm)  Pronunciation Key 
The primary meristem in vascular plants that gives rise to primary vascular tissues (phloem and xylem).
The American Heritage® Science Dictionary
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