eustele[yo̵̅o̅′stēl, yo̵̅o̅ stē′lē]
eustele definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the typical vascular cylinder of a dicotyledonous plant or a gymnosperm, consisting of a ring of collateral bundles of xylem, cambium, and phloem
Origin: eu- plush stele
eustele definition by American Heritage Dictionary
The central cylinder in which the primary vascular tissue is arranged around a pith, as in most seed plants.